Alex Kirk

This plugin transforms your WordPress install into a Wiki for keeping your family history.
<h3>Recommended setup</h3>
In wp-admin go to Settings → Reading and set a static homepage. The plugin also adds an option I would like my site to be private, visible only to myself and users I choose which will usually be an option you’ll want to use since only registered users should be allowed to edit.
Create new users with Wiki User (can edit pages) or Wiki Editor (can also delete pages). Unfortunately otherwise only the roles Editor or Administrator will allow them to edit pages.
If you created a calendar page, set the option <code>family_wiki_calendar_page</code>, for example with the cli command <code>wp option add family_wiki_calendar_page /Calendar</code>, then the dates will be linked to that page.
<h3>Advanced Custom Fields</h3>
The plugin has switched to using Advanced Custom Fields for wiki page metadata. Please install that plugin in version 6.2 or up. The fields should be automatically restored using the provided JSON file in the <code>acf-json/</code> directory.
For each wiki page, you can enter data like birth or death date as well as mother/father/children relationships. This data is used for the calendar page but also for automatically generating a short bio using the shortcode <code>[name_with_bio]</code>. You’d put this as the first thing in a wiki page.
<h3>Gutenberg Blocks</h3>
The Family Calendar block will show all dates from the wiki.
The Birthday Calendar block will show all dates of living people (determined by <code>showage</code>, see above) from the wiki.
<h3>Performance</h3>
For displaying the red missing links or green external links, all pages are evaluated on page load. This works for small sites but won’t work well if you have thousands of pages.
Development of this plugin is done <a href="https://github.com/akirk/family-wiki" rel="nofollow ugc">on GitHub</a>. Pull requests welcome. Please see <a href="https://github.com/akirk/family-wiki/issues" rel="nofollow ugc">issues</a> reported there before going to the <a href="https://wordpress.org/support/plugin/family-wiki" rel="ugc">plugin forum</a>.

Family Wiki

Keep your family history in a wiki hosted on WordPress.

burria

Creates a custom content type to upload pets, displays from 1 to 4 generations (parents are counted as first generation).
When you create a new pet it lets you select the mother and father and then draws a pedigree 
tree when the user is viewing the post.

Laika Pedigree Tree

This plugin creates a custom post type for pets, connected to his parents and then automaticaly draws a pedigree tree.

Family Wiki vs Laika Pedigree Tree