I think you should definitely talk to your T about your desire to have her do this. There's nothing wrong with wanting it. It's hard to be assertive in general--and especially with someone like your parents. I've had the passing fantasy that my T might do something similar. There may even be a family session in your future--scary, I know, but it could be really good to have the opportunity to hash this out with a supportive moderator (your T) around.

I don't know, however, that it would be appropriate for your T to initiate this conversation during a workshop. I think her focus will need to be elsewhere.

Good luck with everything, Firefly!