Dad drama

I have a teenager who has been raised by their step-dad (my husband) since they were 5. My husband claims my child as his own and has been their sole provider. Meanwhile the biological dad lives on the other side of the country and has extremely sporadic contact ( every few years, he doesn't call or send mail for bdays, holidays, nothing). Bio dad also has a couple of other kids that live nearby who he does have contact with. My kid has no siblings on my end. I heard a rumor from a friend who lives near bio dad that newest mom of one of his kids wants to see if that child could have some sort of relationship with my child. If they ever do contact us about that, how do I go about it? Is it more traumatic to let my child think they might be able to have a relationship with bio dad's family that might not work out, or tell them to go to hell? I kind of feel like since my kid is going to be a legal adult in a few years they have a right to choose to pursue a relationship, but I worry I should be protecting them. Any advice? via /r/Parenting http://ift.tt/2wkPOv5