I am looking for any information concerning my paternal great-uncle, Otto or Otho C. Rinehart. Otto was born in Hardin County, Ohio, around 1906; he died in Sept of 2000 in Harrison, Arkansas. Family legend has him insane or a hermit, or both. Otto's parents were Anna Mae (Garlinger) Rinehart and Clinton Ismond Rinehart. He had two sisters, Thelma and Betty, who married and moved to California; he also had two brothers, Harold and Howard, who married sisters and lived next door to each other in Arlington, Ohio, until their deaths.
I would appreciate any tips on how to find out about mentally ill people during that time frame.