DP has a contact order regarding his 7 and 9 year old children. Their mum has constantly breached it and uses the reason that it's the childrens choice - for example - DS doesn't want phone contact, he's busy on the iPad, DD has decided she'd rather go to her friends party and she wants me to take her, DS doesn't want to come because you don't have a paddling pool and he thinks he'll get too hot 
Sometimes it's both DC that don't come, sometimes just one. Last time DD 'didn't feel likeit' and when DS ddiscussed a planned and paid for day out next week, he asked if DD was coming and DP replied 'no idea, she'll be the one missing out if she chooses not to.' AIBU to think that this is the wrong attitude and that the DC shouldn't be able to choose whether they come for contact any more than they can choose whether or not to go to school? They are always happy here and there's no welfare concerns but they are very much manipulated by their mum who bribes them to stay ('we could've gone to Thorpe park, but you're going to your dad's...) and tells them she'll ne lonely without them.
DP seems resigned to this messing around but they are back in court for review next month and I think he should ask the judge to ensure that DSC mum must adhere to the order and not put the DC in the middle. What do you think?