Had a relationship with Rosemary Wright in 1965?

We are looking for a man that had a relationship with Rosemary Wright in Pierre South Dakota in 1965, you may be the bio father of my husband. Or maybe you know who she was dating at that time period? Mu husband was adopted by his grandparents and no family members will tell him the truth. Rosemary's parents were Sam and Jane. Any info will be greatly appriciated.