Sorry, I don't have any information to help you on the grandchildren of James Offill and Mary Louellyn Scott.
Here is what I have on John Offill and wife Jane's children; 1. Elizabeth-married Clement Hasty 2. John- married Eleanor Elliott 3. Mary- married John S. Elliott 4. James-married Mary L. Scott 5. Mahala-married Thomas Miller, and possibly seceond, married a John Cline. 6. Allan-married Louise Hargot(sp). 7. Elzaphen-married Martha Everman.