Wait, so you let your boy take YOUR garage space (that YOU own) and also park a bike in the living room? WTF?
Fack me, You give him the Master Suite in the house, too? Does he even pay rent?
And, the value of your Fusion has got NOTHING to do with it. The boy can have his own garage space when he buys or rents his own damn house. I'm guessing the reason a young guy like him can drive something nice like a Mustang GT and a new bike is because he's not responsible for the monthly costs associated with running an independant household.