The following data is extracted from Alstead, Cheshire County, New Hampshire History.
John Banks, progenitor of the Banks family in Alstead, was in the employ of Nathaniel S. Prentiss, and came with him from Grafton, Mass., in 1774 he married Susan Prentiss and reared a large family of children, one of whom was the father of Gen. N. P. Banks, of Waltham, Mass. Two sons of John,-Andrew and Jabez M., spent their lives in Alstead. Andrew married Fannie Livermore, resided on a farm on road 36, reared eight children, and died in 1876, aged 83 years. His son Gardner G. has been engaged in the manufacture of lumber at the outlet of Warren pond over thirty years. He married Ella, daughter of Jonas S. Partridge, and has no children.
Source: Alstead, Cheshire County, New Hampshire History