Have been separated for over three years. ExH has a young (22) girlfriend of a year. He doesn't want to take time off work to have DD in school holidays as he likes to save his holidays for trips abroad with his girlfriend. She is training to be a teaching assistant and so is off in school holidays and I think he had it in his mind that girlfriend ould have DD in holidays to reduce CSA payments. From what I can gather, girlfriend isn't keen to do that - understandable as exH works away so wouldn't see DD at all. In an effort to get his girlfriend to look after DD (and to try and piss me off no doubt) he's been trying to encourage DD who's 5 to call his girlfriend mummy. DD isn't upset or confused about it, she just thinks he's an idiot. ExH apparently keeps telling girlfriend DD 'needs' her and in my opinion seems to be guilting her into staying with him. DD says he'll buy her stuff if she'll call girlfriend mummy and exH himself has commented how people assume girlfriend is DD's mum-not sure how seeing as as she looks more like exHs daughter! AIBU to ignore his ridiculous behaviour rather than kick off about it when realistically there's not much I can do about it other than reassure DD?