I don't think it would be appropriate for your T to do that during that workshop. Like others have said, a family session would be a better idea. My T has once said that we could have a session with my parents (or one of them) to explain what we do in therapy. I once had a session with my mom to talk about something I found to hard to to on my own. So you could ask your T if it's possible to have one session with you and your parents and you can prepare that session with your T.