The following data is extracted from Marlboro, Cheshire County, New Hampshire History.
Isaac Davis, the seventh son of a seventh son, and hence called Doctor, immigrated from Massachusetts to Roxbury while that town was still a wilderness, residing there until his death, in 1840. His son Joshua was born there in 1796, and died July 2, 1862, while Joshua's son, George G., born in Roxbury, August 28, 1842, has been a resident of Marlboro since 1859. He is engaged in mercantile pursuits, has served as state senator from the 14th District, and was in the late war a year and a half.
Source: Marlboro, Cheshire County, New Hampshire History