diff --git a/README.md b/README.md
index c4dbfd6..f3cb653 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,9 @@
 - [Summary](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/branch/1.1/README.md)
-- [[tutorial 013] A variable with type "choice"](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_013/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_013~1..v1.1_013))
+- [[tutorial 014] Choice type is optional](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_014/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_014~1..v1.1_014))
 
-# [tutorial 014] Choice type is optional
+# [tutorial 020] A family
 
-[View the diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_014~1..v1.1_014)
+[View the diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_020~1..v1.1_020)
 
 
 ## Screenshot
@@ -30,6 +30,16 @@ proxy_mode:
     - Automatic proxy configuration URL
   default: No proxy
 
+```
+### firefox/10-manual.yml
+
+
+```yml
+---
+manual:
+  description: Manual proxy configuration
+  type: family
+
 ```
 ### Generated documentation
 
@@ -43,135 +53,6 @@ foo@bar:~$ rougail -v 1.1 -m firefox/ -o doc -do github
 | **proxy_mode**<br/>[`choice`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Configure Proxy Access to the Internet.<br/>**Choices**: <br/>- No proxy ← (default)<br/>- Auto-detect proxy settings for this network<br/>- Use system proxy settings<br/>- Manual proxy configuration<br/>- Automatic proxy configuration URL                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
 
 
-## User data
-
-### Example 1
-
-#### config/01/config.yaml
 
 
-```yml
----
-
-```
-#### Output
-
-```console
-foo@bar:~$ rougail -v 1.1 -m firefox/ -u file -ff config/01/config.yaml
-```
-<pre>╭────────────────────────── Caption ──────────────────────────╮
-│ Variable                           <span style="color: #ffd700">Default value</span>            │
-│ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
-│ <span style="color: #ff0000">Undocumented but modified variable</span> (<span style="color: #00aa00">Original default value</span>) │
-│ <span style="color: #ffaf00">Unmodifiable variable</span>                                       │
-╰─────────────────────────────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: <span style="color: #ffd700">No proxy</span>
-</pre>
-### Example 2
-
-#### config/02/config.yaml
-
-
-```yml
----
-proxy_mode: No proxy
-
-```
-#### Output
-
-```console
-foo@bar:~$ rougail -v 1.1 -m firefox/ -u file -ff config/02/config.yaml
-```
-<pre>╭────────────────────────── Caption ──────────────────────────╮
-│ Variable                           <span style="color: #ffd700">Default value</span>            │
-│ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
-│ <span style="color: #ff0000">Undocumented but modified variable</span> (<span style="color: #00aa00">Original default value</span>) │
-│ <span style="color: #ffaf00">Unmodifiable variable</span>                                       │
-╰─────────────────────────────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: No proxy (<span style="color: #00aa00">No proxy</span>)
-</pre>
-### Example 3
-
-#### config/03/config.yaml
-
-
-```yml
----
-proxy_mode: Manual proxy configuration
-
-```
-#### Output
-
-```console
-foo@bar:~$ rougail -v 1.1 -m firefox/ -u file -ff config/03/config.yaml
-```
-<pre>╭────────────────────────── Caption ──────────────────────────╮
-│ Variable                           <span style="color: #ffd700">Default value</span>            │
-│ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
-│ <span style="color: #ff0000">Undocumented but modified variable</span> (<span style="color: #00aa00">Original default value</span>) │
-│ <span style="color: #ffaf00">Unmodifiable variable</span>                                       │
-╰─────────────────────────────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: Manual proxy configuration (<span style="color: #00aa00">No proxy</span>)
-</pre>
-### Example 4
-
-#### config/04/config.yaml
-
-
-```yml
----
-proxy_mode: foo
-
-```
-#### Output
-
-```console
-foo@bar:~$ rougail -v 1.1 -m firefox/ -u file -ff config/04/config.yaml
-```
-<pre>🛑 ERRORS
-<span style="color: #ff0000">┗━━ </span>"foo" is an invalid choice for "proxy_mode (Configure Proxy Access to the Internet)", only 
-<span style="color: #ff0000">    </span>"Auto-detect proxy settings for this network", "Automatic proxy configuration URL", "Manual proxy 
-<span style="color: #ff0000">    </span>configuration", "No proxy" and "Use system proxy settings" are allowed
-╭────────────────────────── Caption ──────────────────────────╮
-│ Variable                           <span style="color: #ffd700">Default value</span>            │
-│ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
-│ <span style="color: #ff0000">Undocumented but modified variable</span> (<span style="color: #00aa00">Original default value</span>) │
-│ <span style="color: #ffaf00">Unmodifiable variable</span>                                       │
-╰─────────────────────────────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: <span style="color: #ffd700">No proxy</span>
-</pre>
-### Example 5
-
-#### config/05/config.yaml
-
-
-```yml
----
-proxy_mode: 1
-
-```
-#### Output
-
-```console
-foo@bar:~$ rougail -v 1.1 -m firefox/ -u file -ff config/05/config.yaml
-```
-<pre>🛑 ERRORS
-<span style="color: #ff0000">┗━━ </span>"1" is an invalid choice for "proxy_mode (Configure Proxy Access to the Internet)", only "Auto-detect
-<span style="color: #ff0000">    </span>proxy settings for this network", "Automatic proxy configuration URL", "Manual proxy configuration", 
-<span style="color: #ff0000">    </span>"No proxy" and "Use system proxy settings" are allowed
-╭────────────────────────── Caption ──────────────────────────╮
-│ Variable                           <span style="color: #ffd700">Default value</span>            │
-│ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
-│ <span style="color: #ff0000">Undocumented but modified variable</span> (<span style="color: #00aa00">Original default value</span>) │
-│ <span style="color: #ffaf00">Unmodifiable variable</span>                                       │
-╰─────────────────────────────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: <span style="color: #ffd700">No proxy</span>
-</pre>
-
-
-- [[tutorial 020] A family](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_020/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_020~1..v1.1_020))
+- [[tutorial 021] A sub family](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_021/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_021~1..v1.1_021))
diff --git a/config/01/config.yaml b/config/01/config.yaml
deleted file mode 100644
index ed97d53..0000000
--- a/config/01/config.yaml
+++ /dev/null
@@ -1 +0,0 @@
----
diff --git a/config/01/output_ro.html b/config/01/output_ro.html
deleted file mode 100644
index cdecbe8..0000000
--- a/config/01/output_ro.html
+++ /dev/null
@@ -1,9 +0,0 @@
-<pre>╭────────────────────────── Caption ──────────────────────────╮
-│ Variable                           <span style="color: #ffd700">Default value</span>            │
-│ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
-│ <span style="color: #ff0000">Undocumented but modified variable</span> (<span style="color: #00aa00">Original default value</span>) │
-│ <span style="color: #ffaf00">Unmodifiable variable</span>                                       │
-╰─────────────────────────────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: <span style="color: #ffd700">No proxy</span>
-</pre>
diff --git a/config/02/config.yaml b/config/02/config.yaml
deleted file mode 100644
index d914488..0000000
--- a/config/02/config.yaml
+++ /dev/null
@@ -1,2 +0,0 @@
----
-proxy_mode: No proxy
diff --git a/config/02/output_ro.html b/config/02/output_ro.html
deleted file mode 100644
index 38b2d86..0000000
--- a/config/02/output_ro.html
+++ /dev/null
@@ -1,9 +0,0 @@
-<pre>╭────────────────────────── Caption ──────────────────────────╮
-│ Variable                           <span style="color: #ffd700">Default value</span>            │
-│ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
-│ <span style="color: #ff0000">Undocumented but modified variable</span> (<span style="color: #00aa00">Original default value</span>) │
-│ <span style="color: #ffaf00">Unmodifiable variable</span>                                       │
-╰─────────────────────────────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: No proxy (<span style="color: #00aa00">No proxy</span>)
-</pre>
diff --git a/config/03/config.yaml b/config/03/config.yaml
deleted file mode 100644
index 74edb22..0000000
--- a/config/03/config.yaml
+++ /dev/null
@@ -1,2 +0,0 @@
----
-proxy_mode: Manual proxy configuration
diff --git a/config/03/output_ro.html b/config/03/output_ro.html
deleted file mode 100644
index 675192d..0000000
--- a/config/03/output_ro.html
+++ /dev/null
@@ -1,9 +0,0 @@
-<pre>╭────────────────────────── Caption ──────────────────────────╮
-│ Variable                           <span style="color: #ffd700">Default value</span>            │
-│ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
-│ <span style="color: #ff0000">Undocumented but modified variable</span> (<span style="color: #00aa00">Original default value</span>) │
-│ <span style="color: #ffaf00">Unmodifiable variable</span>                                       │
-╰─────────────────────────────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: Manual proxy configuration (<span style="color: #00aa00">No proxy</span>)
-</pre>
diff --git a/config/04/config.yaml b/config/04/config.yaml
deleted file mode 100644
index e3fa25d..0000000
--- a/config/04/config.yaml
+++ /dev/null
@@ -1,2 +0,0 @@
----
-proxy_mode: foo
diff --git a/config/04/output_ro.html b/config/04/output_ro.html
deleted file mode 100644
index 5fe2e0d..0000000
--- a/config/04/output_ro.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<pre>🛑 ERRORS
-<span style="color: #ff0000">┗━━ </span>"foo" is an invalid choice for "proxy_mode (Configure Proxy Access to the Internet)", only 
-<span style="color: #ff0000">    </span>"Auto-detect proxy settings for this network", "Automatic proxy configuration URL", "Manual proxy 
-<span style="color: #ff0000">    </span>configuration", "No proxy" and "Use system proxy settings" are allowed
-╭────────────────────────── Caption ──────────────────────────╮
-│ Variable                           <span style="color: #ffd700">Default value</span>            │
-│ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
-│ <span style="color: #ff0000">Undocumented but modified variable</span> (<span style="color: #00aa00">Original default value</span>) │
-│ <span style="color: #ffaf00">Unmodifiable variable</span>                                       │
-╰─────────────────────────────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: <span style="color: #ffd700">No proxy</span>
-</pre>
diff --git a/config/05/config.yaml b/config/05/config.yaml
deleted file mode 100644
index bf6f64c..0000000
--- a/config/05/config.yaml
+++ /dev/null
@@ -1,2 +0,0 @@
----
-proxy_mode: 1
diff --git a/config/05/output_ro.html b/config/05/output_ro.html
deleted file mode 100644
index 071b4d5..0000000
--- a/config/05/output_ro.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<pre>🛑 ERRORS
-<span style="color: #ff0000">┗━━ </span>"1" is an invalid choice for "proxy_mode (Configure Proxy Access to the Internet)", only "Auto-detect
-<span style="color: #ff0000">    </span>proxy settings for this network", "Automatic proxy configuration URL", "Manual proxy configuration", 
-<span style="color: #ff0000">    </span>"No proxy" and "Use system proxy settings" are allowed
-╭────────────────────────── Caption ──────────────────────────╮
-│ Variable                           <span style="color: #ffd700">Default value</span>            │
-│ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
-│ <span style="color: #ff0000">Undocumented but modified variable</span> (<span style="color: #00aa00">Original default value</span>) │
-│ <span style="color: #ffaf00">Unmodifiable variable</span>                                       │
-╰─────────────────────────────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: <span style="color: #ffd700">No proxy</span>
-</pre>
diff --git a/firefox.png b/firefox.png
index 45725ac..e40ce96 100644
Binary files a/firefox.png and b/firefox.png differ