they had 8 known children,
Elizabeth b. 1707 m. Richard Baker
Jemima b. 1710 m. Beriah Higgins
Mercy b. 1712 m. John Clark
Rachell b. Abt. 1714 m. John (Fry) Arey
Grace b. November 1, 1716 m. Ebenezer Smith
Theophilus b. January 30, 1719/20 m. Bethia Homer
William b. March 1721/22 m. Mary Brown
Lusana (called Lucy) b. August 20, 1725 m. Gershom Spear

it is more likely he is a son of one of john's brothers if he is related at all

tom wetherell