I Am Looking for My Great Grandfather Ambrose Jefferson Caskey I Found Where He was Born IN Washington CO Ohio on Jan 1851

He married Mary Caroline Eib 5/20/1875 in Indiana. I have found him on a couple of census after 1875 but nothing before that. I would like to find his parents if possible. In some of the census it states his father was born in Maryland and his mother in Indiana. I have looked but I'm just missing something. This would mean a lot to me if I could find parents and siblings if possible. He went by Jeff Caskey in the places I found him. He lived in Darke Co, Palestine Ohio at one point. I have a newspaper article that he was a horse trader/ trainer. He also lived in Arkansas. He died in Arkansas in 1899.
thank you for any help......... Genece Milller (genecemiller9@gmail.com )