[Blarg]

It sounds like your issue with your dad hinges substantially on abandonment, not divorce. Divorce doesn't have to be abandonment at all. Why do you feel your dad walked away from your sisters, rather than simply got a divorce?

And of course, it takes two to tango. It's wrong to blame only one party for a break-up unless the other person really was blameless. As to that, whereas sometimes it will be obvious, a great many other times it will be impossible for anybody, much less a kid, to know what goes on between two people. How and why their incompatibilities became manifest, and how seriously, is probably out of a kid's range of knowledge and maybe even emotional depth more times than not.

Dads are probably even harder to understand in this regard, because men are still raised to be pretty much emotional stick figures in our society, and keep whatever they have inside at all costs.