Family tree▼
'CHILDREN OF JOHN AND MABEL GRISWOLD. ...John, b. March 1, 1720; m. 1750, Phebe Collins; had children: John, b. 1751; Nathan, b. 1756; Adonijah, b. 1759; David, b. 1761; Asaph, b. 1766; Doctor, b. 1770.'
'GRISWOLD, GRISWOULD, GRISWOOLD, ...John. s. John, decd. & Mabel, b. Mar. 1, 1720'
This has to be 1719/20 (inconsistent with most dates in this source), as his father died in Dec 1719.