How do I find my biological grandfather? My mom was adopted and knew her mom but not her father. Her mom would never tell her until the hour before my mom passed away. I was never able to find out and I don't know where my grandmother moved to. Is there a way I can find out for medical reasons and to see where my bloodlines came from.

If you don't have even a name, it's unlikely you'll find out. Even with a name, a date of birth, year of birth, and the area he lived, it would still be hard. With the info (or lack of info) you have, it would be impossible.

Sorry.

If this is for medical REASONS, not medical HISTORY, yes, it's possible. I don't know, however, what year(s) you are talking about. You could be 25, you could be 80. Hire an investigator after you get the Court Order.