I’m a single mum to 3 aged 19,17,17. Dad pays maintenance for the 17 year olds. I am taking all 3 on holiday and have bought some summer clothes for the younger 2. Eldest works and pays a nominal housekeeping amount. But tonight has lost it because I won’t buy him summer clothes for the holiday. I’m gobsmacked that he has been so offended by my refusal. Am I out of order?