MKAC I agree your younger sister bringing her children into it is ******** and you should call her out on that one. It is not good for children to be put in those situations, those are adult problems and no child should be exposed to that. Your their aunt, blood and they need to love freely like children do, they will learn about the cruel world soon enough. Sorry about the older sister too, I could see where a g/f and xhusband meet up can be weird, as I lived that...birthdays were great for the girls... awkward for adults but we acted as adults for the kids sake.