BIL has come into some money. Wants to give his ex a substantial amount because she has his kids and lives in rented accom. My sister has lived with him for years. Some money is going to house renovations on there house. However he always said that he would get married it was just a money issue. Now he is saying marriage was never important and he hasn't got it as giving it away to ex. My DS has taken them on holiday each year etc too. AIBU to think he should be putting his current partner first? He already pays maintenance, half towards everything, childcare etc so it's not that his ex and children are not supported.