Bonding Over Missing Parents has these relationships to other tropes:

parents kids shares a parent with:
Commonality Connection
Parental Abandonment
parent child
Parental AbandonmentBlitz Evacuees
''Conveniently An Orphan
''Missing Mom
''Disappeared Dad
''Deceased Parents Are The Best
''Promotion To Parent
''Death By Childbirth
You'll need to Get Known if you want to add or modify these relationships.