i think its crucial that this section explains what the voter does in a way that the reader understands it. let me try to rephrase:

This voter is similar to the :ref:`bundles_menu_voters_request_identity_voter` but instead of comparing the content in the request with the content of the menu item, it compares the *parent* of the content in the request with the content of the menu item. If the current page is a blog post, but there is only a menu item for the blog overview, and the blog post has as parent the blog overview, the blog overview menu item will become the current item.