Dixied,
Wow that is a Godincidence, isn't it!
Anyway, what I would do, and mind you, this is ONLY what I would do...is see a lawyer. If your son is written as the father of that child on the birth certificate, then you are entitled to "Grandparents rights" which includes visitation...check it out.
This post makes me kind of angry, because my sons GF took my grandaughter away when she was 18 months old, and I haven't seen her since. She would be 14 now. I went to a lawyer, but my sons name wasn't on the birth certificate. (smart girl, actually)
Hugs,