Stay out of it!! Tell them both that you love them, but do not want to be made to feel like you have to take sides. If you want to remain friends with both of them you cannot get caught up in their hateful remarks of each other. You can support both of them by being honest with them about how you feel. Good things to say when they are spouting off about each other would be, "I'm sorry you feel that way, I know you just want to vent, but it makes me uncomfortable," or "I wish I could make everything better for you, but I can't, this is between the two of you." As far as the kids go, they will need someone they can talk to and feel safe with, you can be that as long as you do not step over any boundaries. When they are using the kids as pawns, maybe ask them if they would like you to take the kids until they cool down. Be honest with your friends, tell them your concerns..in a gentle, nice way. They are both reactive right now due to the situation. Talk to your kids about this too, tell them what is going on and if they have questions to ask.