Solution:
To filter the view result by parent, You will require to add a "Post relataionship" query filter from your "Query Filter" section of your view/block view and set the option "The post where the view is sown".
Problem: I would like to add a post owner filter to a View of a Repeatable Field Group (RFG). I am building this View in the Blocks editor, but I cannot see any way to add a dynamic filter based on the post being displayed.
Solution: Select the top-level View block using the Block Navigation menu, then you will find a Query Filter configuration panel in the right column of the Block Editor screen. You can add a post owner filter or any other Query Filter here. In an upcoming release of Views, you will be prompted to select this filter during the creation of the View. This improved workflow will help resolve this confusion.
Problem: I have two custom post types. On the template for CPT A, I would like to display two posts from CPT B in a View. In the post editor for CPT A, I would like to choose which two posts should be displayed in the View.
Solution: Use a many-to-many relationship between CPT A and CPT B to select which posts from CPT B should be displayed in each post of CPT A. Use a View of CPT B with a post relationship filter in the template for CPT A to display the selected posts.
Problem: I have a one-to-many relationship set up between two post types. In the child post single page, I would like to display a View of other sibling child posts.
Solution: This feature does not currently exist in Blocks, but in classic Views you can create a Query Filter for post relationship, where the parent post is set by a shortcode attribute "wpvrelatedto". Then you can provide the current post's parent post ID in the View shortcode as shown here:
