What should I do with my difficult son?

Yesterday we were driving to Gerudo Valley (me, wife and son) and my son was acting so rudely towards me and my wife. We were going to visit our very good friends, The Swindler and his wife Martha. The Swindler and Martha were serving lasagna and our son told them McDonalds had better food. Why has our son started acting so weird and impolite? He also complained all the time that he wanted pocket money. I have not given him pocket money in four weeks because he has been so rude. He is 15 and he soon needs to get a job and earn his own money. Maybe he could learn something from The Swindler??? I am considering giving him away to Martha and The Swindler because I am so tired of him. He tells me he does not want to be a con artist but is he good for anything else??? He just goes around insulting people and his only ambition is money. Should we give away our son and let him live with Martha and The Swindler? Or should we let him live with us until he is 18? I am sure the swindler could take better care of him. Our son has bad grades and can not get a job with these grades. He could learn some swindling from The Swindler.