Would I be unreasonable to not want to take DD who is 9 months to a relatives 40th birthday party on the basis that she gets very upset if she is out of her routine as she normally has a bath, bottle and is in bed by 7.30. We can't get a baby sitter as my parents are away on holiday at the time. DH could go on his own which I think is reasonable but I know DH's family are going to get the arse over it. AIBU?