The David Allen Abston you refer to was on the 1850 census, age 16, in Bibb County, AL. He was living in another family's household as a farm laborer. But at the top of the page was an Abston family who had children the right age for him to pe a part of that family. Head of the household was Olive Abston from SC, age about 55. If you need more info, please contact me.