My parents split when I was 10 and I don't think I ever really got over it, one thing I've learnt is that in that situation it's paramount that the kids get the full support of the parents. Try not to lose it with eachother infront of them, it only breeds resentment and certainly don't play each other off against them.
My Mum left my Dad when I was about 10, she left us and moved to London for what seemed at the time like about 6 months (I've since found out it was about half that), left a note, the works. My Dad was heartbroken when he told us. I remember her coming back to visit us and she stayed overnight, she walked into the house and said "well then", with her arms held out, I just wanted to say "FUCK YOU". Anyway she returned back to London and a few weeks passed and I guess my Dad just thought enough was enough and he went down to where she was staying and brought her home. They stayed together then for months, we went on holiday and everything seemed the norm, we moved house aswell. Then like a bolt from the blue came the sit down and talk, they were splitting up. Hard to take to say the least, it was like having your heartbroken twice. My Dad met someone else, lives a quiet life and is a good guy, if quiet and introverted. My ma met dickhead after dickhead but is now finally settled with a good guy, though it's taken some 20 odd years and all matter of hell for us to be dragged through.
Anyway, the toss of the coin, I split with my oldest's Mum when our baby was just two years old, but we all get on fantastically, both our partners get on really well, are kids are all friends too and my daughter is an angel who gets on great with both of us, she was lucky in that me and her Mum both met great partners who gave her as much love and attention as we did.