My XH has 'made' our children do things like go on holiday with him and OW. Ok so they went, to keep the peace but believe me they resent him for it.
Seems you have two sides of the coin to consider MMF. At the end of the day I still believe your kids are old enough to make up thier own minds but like mine they are falling prey to manipulation by the WAS along the way.
Me 43 XH 45 M 2.7.88 Divorce 7.10.09 Kids D20,S17 & D15