The following data is extracted from Keene, Cheshire County, New Hampshire History.
Daniel O'Brien came to America, from Ireland, in 1839. Six of his ten children are living, as follows: Nancy, Ellen, Caroline, Michael, Daniel, and Thomas. Mr. O'Brien died March 16, 1884, and his wife, Mary, died March 11, 1880.
Source: Keene, Cheshire County, New Hampshire History