My 12 yr old has turned into a grumpy, stroppy individual who doesn't want anything to do with the rest of the family. He refuses to eat with us but we insist and won't look at us when he speaks to us. When out and about he does this hilarious routine of pretending he's not with us. He's only nice to me when he wants me to buy something for him. He doesn't want to do anything apart from play on the PS3, Facebook or sleep.....