Bumping an old thread I saw a guest looking at. It is a good question.
My parents split when I was 10. Lived with my dad for a while as it was my mum who had left. But my dad's partner (narcissist) played me and my sisters against each other so we were always fighting. Two of my sisters were favoured by her and me and my other sister (I have 3 sisters) were neglected in a lot of ways. So my mum came and got me and my sister while my dad wasn't aware of it. Then I lived with her and my first stepdad (I have had 2 stepdads, heh).
My first stepdad didn't end up marrying my mum but my second stepdad did, when I was around 21 I think and they are pretty happy now. I live with them for the majority of the time and it seems pretty functional.