Barbara, Here's what I found immediately, don't know about John's marriage date.
AMOS (5) CHAFFEE (JOHN4, JOHN3, JOSEPH2, THOMAS1) was born in WOODSTOCK, MASS 8/9/1744. AMOS died 2/3/1815 ROCHESTER, VT., at 70 years of age. He married ANNA BROWN STAFFORD, CON., 1769. ANNA died 2/22/1831 ROCHESTER, VT.. Her body was interred ROCHESTER, VT.. He was baptized in WOODSTOCK, CON, 10/7/1744. Religion: religion unknown.
AMOS CHAFFEE and ANNA BROWN had the following children:
ELEANOR6 CHAFFEE was born SOUTH WILBRAHAM 5/17/1771. ELEANOR died 11/22/1848 at 77 years of age. She married JAMES THRESHER. AMOS CHAFFEE (JR) was born SOUTH WILBRAHAM 5/13/1773. LUCY CHAFFEE was born SOUTH WILBRAHAM 4/30/1776. LUCY died 11/18/1826 at 50 years of age. She married ELIAS RICHMOND. JOHN CHAFFEE was born STAFFORD, CON. 9/3/1778. LEONARD BROWN CHAFFEE was born STAFFORD, CON. 9/2/1780.