The Isham Gay in my family died around 1790 and was married to a Mary Daughtery. His sons, Kinchen and Eaton were around 10-12 years old at the time and they were bound over their uncle Joseph Daughtery in 1791. Evidently Joseph raised them. Is it possible that your Isam is the same one possibly married to Sarah Owens before Mary Daughtery? Do the dates of your Isham match up?