TW: Small mention CSA and other abuse (sorry for the trigger warnings but sometimes I get triggered by the smallest things)

I have told my T very little about my childhood, just basic stuff when I was manic and feeling chatty. He knows a little about the CSA and some other physical abuse by family members.
Every so often he wonders out loud about my childhood or says "I don't know much about your childhood but..." Is it something T's talk about often? Do they leave it up to the client to bring up or do they ask outright?
I really don't want to tell "family secrets" as i feel I am being disloyal in some way.

I suppose my question is, Has anyone talked in depth about their childhood and did it help any?

Thanks in advance for your responses.