First, I am sorry that your father is involving you in his divorce. And it seems, in his marriage to your mother. He shouldn't be doing that, period.

Just because you are an adult doesn't make it okay. And if you are not an adult, what he's doing is even worse.

Let your parents deal with their divorce. It is their divorce, not yours. You have no business in the middle of it.

But to answer your question, the inheritance is probably not community property (a lawyer would be able to tell your father for sure). The retirement is community property and will be split 50/50, along with any of the marital debt. California is a community property state, all marital assets get split.