how do i get out of it without being rude

I"m confused 'theres to many people in this world that could give a darn less about there kids and it sounds like you get rewarded like my sisters only daughter it doesn't sound like your being bought , it sounds like a huge LUV reward for being a descent respectfull person , take the car and give more luv back they obviously care about you very much , more than words could say. good luck with your delema I would not hurt there feeelings and decline but that's just me I never had that delema