As the mom of two adoptive daughters and four biological sons, I have to say that I am glad our adoptions were closed. If they had grown up having contact with another family, I feel it would have given them the idea that they weren't as much a part of OUR family as our boys. They know they are adopted and we talk about it openly (they are a different race, so it is obvious anyway).
If and when they decide (at least 18 years old) that they want to find their birth mothers, I will gladly help them do that. As children, I think that would be too much to handle.
We adopted domestically, but through an adoption attorney instead of an agency to avoid open adoption.
I'm sorry your adoptive mom hurt you with her comments. I try to be aware of what I say to them about their being adopted and never make a difference between them and our biological children.
:grouphug: to you.