Automatically toggle the parent categories when a sub category is selected.

Set a "parent page" for custom post types that is indicated in menus, lists of pages, and the Simple Section Navigation widget.

TreePress is a simple solution for creating and displaying family trees on WordPress.

PLUGIN IS DISCONTINUED!

Filter pages in the wp-admin by their parent pages

This plugin helps you redirect any 404 request to the parent URL.

Inherit the featured image from the Post, Page, or Custom Post Type parent, grand-parent, great-grand-parent, etc.

Unlinks parent pages in page menus and lists. Useful for creating dropdown menus with top-level placeholders. Affects the output of wp_list_pages and …

Remove Parents is a tiny plugin which remove "category" and parent categories from permalink.

Check all parent taxonomies on check, uncheck all sub-taxnomies on uncheck. Compatible with WordPress Gutenberg. Working with WordPress hierarchical …

Helps you in selecting parent-children categories.

Allows editors to change the parent post of an attachment after it has been set.

Displays the most logical arrangement of Parent, Child, & Grandchild pages.

This widget plugin will display a backlink to the parent page at the end of subpages

Simple plug-in for editing the parent comments to any user comments. Use it to edit the threaded structure comments.

Unlinks parent categories/taxonomies in category menus and lists. Useful for creating dropdown menus with top-level placeholders.

Provides the ability to set the parent_id of a new page from within the link to the new page form

Add template file loading rule for 'Pages'. When loading the template of the child page, preferentially loading the template file that conca …

Set any post type (or types) as parent of any post type. Any post structure can be created with this plugin.

Dynaparent (Dynamic Parent) makes it much easier to choose a parent page on websites that feature a huge number of pages and subpages.