In the 1850 US Census for Troy Ward 5, Rennselaer County, New York the family of Margaret Holcomb was enumerated as follows:
Dwelling #1876; Family #2966
Margaret Holcomb, 58, F, b. New York
Elizabeth Holcomb, 20, F, b. New York
Mary Barnum, 35, F, b. New York
Mary E. Barnum, 11, F, b. Massachusetts, Attended school within the year
Patty S. Barnum, 8, F, b. Massacusetts, Attended school within the year
James H. Barnum, 6, M, b. Massachusetts, Attended school within the year
[Note: the family of Margaret's son Simeon Holcomb was living next door].