My question involves criminal law for the state of: Arlington georgia

My sister is 26 and received a brand new card, polished, metallic lighting out of the dealer ship for her 18th birthday. Upon inquiring my father snapped "Mike Sarah was a good student and completed high-school."(take a fun look down in my profile to understand this reference) I am getting a bike, k-mart brand, worth about 100 dollars. He has agreed for me to pay 50 and he pay the other half(Sarah got her car, insurance included, for no cost to her) I was wondering who gets to "own" the bike?

Since we are splitting it.