Parents of Rubin Beard, Grant Co, KY

Looking for the parents of Rubin/Reuben/Reubin Beard or Beaird of Grant County, KY.Rubinis in the 1850 Grant County census living with the Blackburn family.He is 14 at the time.I cannot find him anywhere in the 1860 census, but in 1870, 1880, 1900 he is in Hancock County, Illinois, and in 1910 he was across the river in Lee county, Iowa.He died in Lee County, Iowa and is buried in an unmarked grave in Oakland Cemetery.He was married to Nancy Jane Heeron (from son Fredericks obit).Nancy Jane was supposedly from KY also.They were the parents of 10 children, but i can only find 5.I need to know who the parents of Reuben was and what was his relationship to the Blackburn family.Thank You.