I think it's important. Two reasons jump out at me...

1. You might have reactions today that are based off childhood circumstances. So, your reaction in context may look like it doesn't make sense... but when you figure out where it comes from, it makes total sense. I think understanding where these things come from and how they were useful in one context can help us let them go today, and learn new ways of interacting.

2. Unresolved childhood crap and trauma. I *know* some of this stuff still affects me... my hope is talking about stuff with my therapist will help me "resolve" it (whatever that means!) and get on with my life. This probably is related to #1.

Are you sure your Ts aren't keen for you to talk about it? I didn't think my past Ts were either... but now, I think they just didn't want to lead me back to that. I think they would have been delighted had I started talking about it on my own. (I think?). Anyway, my current T is open to talking about this stuff... he does alot of family-systems work, so I think he finds it valuable in understanding the "context" that I came from.

Hope this helps. And, sorry about your mom. I think that would be very valuable to talk about with a T (assuming you have a good relationship with a good T). My guess is that a good T would be able to listen empathically, and see the connections with what happened in your childhood and how you react to people now... and help you see them too.

I'm not sure how you actually do that... maybe start with something like, "hey T, I've been thinking alot about some stuff from my childhood. It's a bit hard to talk about, but I'd really like to try... can you (help me out, listen, etc)?"