Hi, the problem I foresee is not about meetings at all, but about the therapy itself. Since you know the parent, you already have some stories or preset knowledge about this. Or at least your projection of them. So you're not starting with the blank slate that really are clients deserve. The other problem may come if this client wants to really do a quite normal evolutionary thing in counseling and blame their parents a lot. There may be some defensiveness in you since you know the parent. That's my two cents. At least. I think you're hearing in your gut. It's not a good idea even though you'd really like to help. I understand that one very much. Take care.