FLTC, I'm confused! You could've taken the kids but wanted to set boundaries or you had plans and therefore could not take them? If you could've but decided this was boundary setting time I'd have to question your judgement in this case. Your STBX's concerns about your girls are not fantasy, they are real and you know that. It's not outlandish in co-parenting that one helps out the other. Now, of course, she turned you down once and obviously has a onesided view of co-parenting, but you still need to do what's best for your family, not take vengeance on her for not being there when you needed it. If you did say yes you could put in a little reminder that next time it's her turn to help you out. Now, that said, if you had plans and it was unreasonable to change them then you have every right to say "sorry, no can do...but here are some suggestions". Anyway, I hope you have a great Thanksgiving despite this bump in the road. Take care.