We have an agreement that each set of grandparents have a one week holiday with the children each year. His tend the take the children skiing at Easter. Mine do a summer break. DH mentioned a while back that he wanted to do something extra at October half term which I said no to (for various reasons, such as cost of petrol getting there, other things booked in already). DH is basically saying that he is going ahead anyway because his father has booked and paid for it, but would love me to come too, knowing that I will refuse due to difficult relations with his family. This is fairly typical of their behaviour, treating me as irrelevant and making plans with my children (aged 6 and under) without consulting me. I've told him that I will take the children off somewhere else first, but of course won't do so in practice. Do I have any powers to stop him and aibu?