Forrest Walker

My friends late Father was, Forrest Walker. Her later Mother was, Helen Elizabeth Greenmore- Walker. Helen, was both born and died in Indiana. I have no information, regarding her Husband Forrest. However, Forrest and Helen's childrens names are, Mary Helen Walker, Larry Walker, and Ronald Walker.

Any missing information, regarding Forrest, might help me locate my friend Ms. Mary Helen Walker. Thank you for your time.