1850 1850 census showing Samuel and Jane Coulter in Canaan Twp, OH
The census lists the following household members: Samuel (54); Jane (69); Elizabeth (21); Samuel (20); William (?); Robert B. (2). Samuel and Jane were born in PA, the children born in Ohio. This roughly consistent with the 1794 birthdate given for Samuel.
THEORY: William and Elizabeth are the parents of Robert. FLAW: William had a sister named Elizabeth.