DS is 12 and lives with his dad. For Xmas he asked me for money. Originally it was going to be 200 pound. However, he's been a complete sod, hasn't been in school for 4 weeks, when he was in he was disruptive. He's sent me message telling me to fck off and he's carved "d@ckhead" in the side of my dp van. We've had no apology from him and the rudeness just keeps in coming.
Am I being unreasonable to give him half of what I told him he would get? Due to his behaviour and attitude?