The most bizarre situation I am aware about re this was with a friend of mine from school.
It was common knowledge that her parents were only staying together because of their daughter and when she hit 18 they would split up. Both parents were seeing other people and when my friend was 18 both went their separate ways with their 'other' partners.
I know I was aware of the situation whilst I was at school but I have never known if my friend was aware. She is also not a good enough friend to ask what she thought about the situation so I'm not sure what impact (if any) it had on her.
Not sure what I think about this situation but I do think it's a big mistake to stay purely because of the children, not only in obvious situations where there is DV or alcholism, but also when the animosity can't be kept under check.
My partners parents had one of the most horrendous relationships I have ever seen although there was no violence or alcoholism (in fact both were tee total). They are from a different culture where divorce isn't really an option plus his mother considers herself a devout Christian (although the most unchristian person I know). His parents literally couldn't speak to each other without it turning into some sort of conflict. His Dad always told him 'never get married' and sure enough has always refused and despite the fact we have tow children won't even live with us (thankfully that suits me down to the ground!) which I'm sure stems his parents highly dysfunctional relationship.
DP and I have been together 12 years (after a split of 10!) and are regarded as having one of the best relationships out of our friends so it's not worked out too badly. Just wondering what path our sons will take when they're old enough to choose.
Sorry that's a bit of a ramble.