They Do has these relationships to other tropes:

parents kids shares a parent with:
Happy Ending
Official Couple
Romance Arc
parent child
Official CoupleHappily Ever After
Romance ArcBoy Meets Girl
''Just Friends
''Will They Or Wont They
''Relationship Upgrade
''Did Not Get The Girl
''No Romantic Resolution
''Marry Them All
''Dump Them All
''Uptown Girl
''Romance Sidequest
You'll need to Get Known if you want to add or modify these relationships.