Profile: davidm-13

Problem:
list parent post only once when listing child posts OR Group by parent posts when listing/displaying/showing child posts.

Solution:
You can use the View's filter hook "wpv_filter_query_post_process" to group child posts by parent posts.

You can find the proposed solution in this case with the following reply:
=> https://toolset.com/forums/topic/split-search-terms-in-custom-field-list-parent-post-only-once/#post-2000697

Relevant Documentation:
=> https://toolset.com/documentation/programmer-reference/views-filters/#wpv_filter_query_post_process