I am descended from this couple through their daughter Isabel Barkman . The information I have is that John Barkman's father was Jacab(probably Jacob) Barkman who was a full blood Miami indian. John and Hannah's daughter Isabel was born about 1838 in Texas and is buried in Mt. Pleasant, Texas. She was married to John J. McClusky who was born and died in Texas. How are you related to these Barkman's and what other info do you have?