I have the same 1744 marriage date. The Chamberlain family is documented in Prentice Glazier's book -- Chamberlain Families of Early New England and New York Vol. 2 page 54. Susannah's (1745) two siblings are Joel and Abner. Her father, Joseph Jr., died in the 1750s, exact date unknown. Her grandfather Joseph, Sr. [son of Clement Chamberlain of the William line, Billerica, MA] is buried in Amenia, Dutchess County, NY with death date listed as April 8, 1765. It was my understanding that Colby was Joseph, Sr's. son, and Susannah's uncle.