S.F.
I was 13 when my dad moved out. It was hard. But there were some very odd things too.
My parents were so miserable when together that I actually spent MORE time with my dad once he moved out than I had when he was working 60 hours/week to avoid spending time with my mom.
My parents had the most amicable divorce that I've EVER heard of, because they put my sister and me first. They continued to co-own the house (dad making 1/2 the payments) until my younger sister was out of high school, so that we could always go to the same high school. (Then they sold it and split the $$.)
They also continued to back each other up when it came to us (much to our annoyance when we tried to play them, lol).
But I don't think I've answered your question. My dad worked to make sure we knew he wanted to be with us, even when we weren't always nice to him because we were mad he left. Just work to be there for them. And keep working at it, no matter what.
So much good luck to you.