My siggy pretty much divides them all up, but I'll write it all out here.
Chloe is mine. Dameon and Rinnie (the ferrets) are mine, and Cid (the dwarf hamster) is mine. Apollo is "mine", but it is up in the air whether or not he will be coming with me when I move out. In all honesty, in recent months he is more of my mom's cat than he is of mine. She feeds him, cleans his box, buys him food, and cuddles with him. I just do his vet care and am the one that raised him. lol
Pheobe is my mom's cat, and Rose is the family dog (ie., my mom takes care of her and I advise my mom of how to take care of her/train her/bathe her). Joey (the bird) belongs to the family - really no one. He started off as mine, but he hates me and I've come to realize I don't want a bird, so everybody just sort of takes care of him.
The outdoor cats are basically family cats, but they "belong" to certain people. JJ and Lilly are my sister's. Mitzi is my dad's. Mikey is the family's (kind of mine as I do his vet care, kind of my youngest sister's as she "picked him out" as a kitten) and Penelope is "mine" in the sense that no one wants her so I've taken responsibility for her care.