Mary Holgate was born 8 July 1882 in St. Johns, Apache County, Arizona, United States to William Holgate (1846-1915) and Eliza Pace Gibbons (1853-1909) and died 8 December 1973 Mesa, Maricopa County, Arizona, United States of unspecified causes. She married Frederick Nielsen (1875-1969) 19 December 1899 in St. Johns, Apache County, Arizona, United States.
Children
| Name | Birth | Death | Joined with |
| Nellie Magnolia Nielsen (1901-1985) | 1 June 1901 St. Johns, Apache County, Arizona | 14 June 1985 American Fork, Utah County, Utah | Hugh Richey (1896-1979) |
| Mary Eliza Nielsen (1903-1978) | 25 June 1903 St. Johns, Apache County, Arizona | 6 February 1978 Farmington, San Juan County, New Mexico | Moroni Forest Richey (1893-1932) |
| Elizabeth Augusta Nielsen (1905-1905) | |||
| Louie Louise Nielsen (1906-1995) | |||
| Frederick Moroni Nielsen (1908-1934) | |||
| William Ole Nielsen (1910-1993) | |||
| Edward Zenic Nielsen (1912-2003) | |||
| Olive Eve Nielsen (1914-2006) | |||
| Lenore Nielsen (1916-1998) | |||
| Eva Nielsen (1918-2000) | |||
| Nina Nielsen (1920-1920) | |||
| Roland Holgate Nielsen (1921-2004) | |||
Siblings
| Name | Birth | Death | Joined with |
| George William Holgate (1868-1878) | |||
| Elijah Thomas Holgate (1870-1938) | |||
| Myron Adair Holgate (1872-1952) | |||
| Name | Birth | Death | Joined with |
| Andrew Smith Holgate (1876-1878) | |||
| Martha Rizpah Holgate (1877-1962) | |||
| MIlo Binns Holgate (1879-1881) | |||
| Miriam Josephine Holgate (1880-1965) | |||
| Mary Eliza Holgate (1882-1973) | 8 July 1882 St. Johns, Apache County, Arizona, United States | 8 December 1973 Mesa, Maricopa County, Arizona, United States | Frederick Nielsen (1875-1969) |
| Willard Holgate (1884-1903) | |||
| George Lester Holgate (1885-1972) | |||
| Richard Gibbons Holgate (1888-1927) | |||
| William Smith Holgate (1890-1892) | |||
| Ruth Leila Holgate (1893-1934) | |||
| LeRoy Holdate (1895-1901) | |||
| Julia Holgate (1897-1898) | |||