My former therapist told me things that were relevant to our discussions, she's told me she's been divorced twice, she has kids (showed me photos of two of them), though I don't have kids so I don't know how that was relevant to me. One of her granddaughters has the same name as me (weird as my home isn't super common), she recovered from bulimia, she was born and lived in Boston growing up, and some other things that I can't think of. My group therapist (well all of the group therapists I've had) were/are open with their lives. I don't think I could work with a blank slate except for psychiatrists, I don't care about their lives, I really don't care too much about the therapists lives either but do like relevant self disclosure.