Looking for my husbands biological grandparents.His mother was adopted and is now 81.Not much chance her real mother is still alive but you never know.I'm sure she was really young when she gave her up {personal info removed}

The odds of you finding your mother-in-law's biological parents is slim to none.

Records were sealed, and without a medical reason, you're not going to be able to get them unsealed.

Have you tried reunion websites?