Obtaining a police report from the 1950s?

Depends on if she reported the . If it wasn't reported then there will be no report. Call you local PD and ask them if any report was made and they can archive the reports and see if one exists. Records kept back in the 50's and early 60's are going to be hard to locate. Also see if you can check birth records on your oldest uncle and see who the father was listed on the birth doent, if possible. You can also check with hospitals that your oldest uncle might have been taken to when he was a child, and see if they have any information. I know its a long shot, but would bring peace of mind to you and your family if you knew. Don't give up, because something might be out there somewhere. Good luck to you.