Who shouldn't be your marriage counselor?
Looking for opinions on whether one spouse's longtime individual therapist is an appropriate choice for the couple's marriage counseling.
Say Terry is married and childhood trauma issues surface so Terry begins seeing a therapist. This therapist/patient relationship would go on for 20 years, and at some points, Terry's therapist also saw Terry's child and Terry's then spouse because it was a very high-conflict marriage.
Terry's first marriage couldn't be saved, so the therapist then also helped Terry negotiate leaving that marriage, the fallout that came with that very high-conflict divorce, etc. Eventually, after 20 years, Terry's therapist said Terry got as much as possible from therapy, so Terry stopped going to therapy.
Years later, Terry is remarried. Now Terry's enmeshed relationship with that child from the first marriage (who is now an adult) has caused problems in Terry's second marriage, so Terry has landed back in marriage counseling with that same therapist and his second spouse.
So here's my question: Should Terry and the second spouse be seeing Terry's longtime individual therapist for marriage counseling...this being the same therapist who saw Terry's first family 30 years ago when that marriage was on the rocks, and treated Terry for 20 years for trauma going back to when he was a little child?
I'd especially appreciate any counselors or therapists who can weigh in on the ethics of this or any conflict that might result from a new person entering what is an already-long established patient/therapist relationship.
Thanks in advance.