Good question, hon. I've had friends on both sides. Imagine your mom and dad on the outs ,but still living in the same house.As a child, how weird would it be to have your dad at home on a Friday night while your mom goes out on a date? Don't think so.
On the other hand, the kids have a mom and dad who obviously can't stand one another, and the children feel the tension.Mom's not living at home, but when she's around, you know there's no love loss between the parents.
The first couple are at least mature enough to remain friends, possibly for the children.
Either way, the kids are the ones to suffer.Now and in the long run.