Attaching more than 1 parent (Post) to a media file

Posts/attachments can only have a single parent post, this is because the posts parent is a single column value in the posts table. This cannot be changed without making major modifications to WordPress core itself, and would introduce other unforeseen problems due to ambiguity.

Instead, if you want to group things by family member, you should use a taxonomy named family_member or something to that effect. Taxonomies are how you’re meant to organise and group content.

How you would integrate that into the Pods selection UI in your question however, is a subject beyond the scope of this stack, you need to ask in Pods communities or Pods support

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