One other note- Polly (Mary)is mentioned in the will- sh receives all the rents after her mother, Margaret's decease.
In the will, Isaac also bequeaths "after the death of my wife I give my plantation and Tract of Land Whereon I now live to the heirs of Joseph McKissick dec'd equally." So apparently, Joseph predeceased his father.
Also, the will source is Union County Will Book B, page 209, Box 21, Package 28.
Witnesses were: JJ Foster, JP McKissick and Elizabeth J Foster.