I have two post types in hierarchal relationship (parent/child).
Parent: Partner
Child: Grant
I have a grant listings page where the user can filter on grant fields. I need to be able to include a text search for the user to be able to do a search on the parent's post title. I have tried using id="$partner" but that doesn't do anything.
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That is not yet possible with Toolset
We are working on similar features but there is no ETA for that.
For now, you'd need to create a View and query the post type that you want to search in, otherwise, you cannot search by "Related" posts fields or data.
The only what you can do is search by a Post Relation itself, this means, you can search a list of Posts (Childs, for example) by their related posts (maybe parent post)
Here is the link to the Documentation on how to achieve that:
https://toolset.com/documentation/user-guides/front-page-filters/