Well, this is interesting.

My T was my son's T 6 years ago. My son saw him for about 3 months in high school, and hasn't seen him since. When I was looking for a T--I asked my other son's T for a referral and he gave me T's name, I said, "Oh I know him....

I don't think the fact that he saw my other son affected my relationship with him, but he wasn't his T for very long. Now, my older son asked if he could see my T and I said, no that wouldn't be appropriate. He has a very good T of his own.