Youngest Child Wins has these relationships to other tropes:

parents kids shares a parent with:
Theory Of Narrative Causality
parent child
Theory Of Narrative CausalityMillion To One Chance
''The Good Guys Always Win
''Underdogs Never Lose
''Finagles Law
''Anthropic Principle
''Your Princess Is In Another Castle
You'll need to Get Known if you want to add or modify these relationships.