If there is nothing beside the character, it is free.
Post where you think you should go!

Pyro - Wife =
Spy - Husband =
Scout - Second Child = Me
Heavy - First Child = Messed
Medic - Spy's Bro AKA Uncle =
Demo Man - Dude who randomly comes over = InsaneNinja
Enginer - Cousin =
Soldier - Cousin =
Sniper - Pyro's First Husband =

There's the Team Fortress Family. :3