Your Princess Is In Another Castle has these relationships to other tropes:

parents kids shares a parent with:
Theory Of Narrative Causality
Disc One Final Dungeon
parent child
Theory Of Narrative CausalityMillion To One Chance
''The Good Guys Always Win
''Underdogs Never Lose
''Youngest Child Wins
''Finagles Law
''Anthropic Principle
You'll need to Get Known if you want to add or modify these relationships.