Are Adoptee's Entitled to Know Who Their Biological Family Is?

Yes I think it is very important, from one who spent years doing a family tree it is so important for the truth to be out there, every person has the right to know their family line for future generations.

Tough call..... I think that it all comes down to the wishes of the biological parents of the child. Giving up a child for adoption in most cases would be an extremely traumatic experience for the biological parent and some may wish to maintain denial. Not fair on the adoptee though, I agree. The least your biological grandparents could do is maybe pass on a letter or something? Give your bio mother the chance to decide for herself rather than have others decide for her?

They can't stop you from contacting your birth mother if that's what you want to do. But you do need to keep her feelinss into consideration too. Send her a letter and tell her if she wants no contact that is ok with you but that you would be thrilled to have that chance to get to know her. She may not answer right away. It's a big shock and all the emotions from the past will come up. So give her time. But just because your maternal grandparents don't want you to contact her doesn't mean that you can't.