My 1st therapist was my mother's therapist. But I started therapy with her after my mother terminated. The thing was, most of my issues at that time revolved around my mother. So my therapist understood a whole lot because she knew my mom. But in retrospect I think it was a terrible idea. I believe in the therapist having a clean slate with the patient. I would avoid sharing therapists knowing what I know now... even if it is at two completely different times.