William Hathaway Forbes was born 1 November 1840 to John Murray Forbes (1813-1898) and Sarah Swain Hathaway (1813-1900) and died 11 October 1897 of unspecified causes. He married Edith Emerson (1841-1929) 3 October 1865 in Concord, Middlesex County, Massachusetts, United States.
Children
| Name | Birth | Death | Joined with |
| Ralph Emerson Forbes (1866-1937) | 10 July 1866 Milton, Norfolk County, Massachusetts, United States | 16 March 1937 Savannah, Chatham County, Georgia, United States | Elise Mason Cabot (1869-1959) |
| Edith Forbes (1867-1926) | |||
| William Cameron Forbes (1870-1959) | 21 May 1870 | 24 December 1959 | |
| John Murray Forbes (1871-1888) | |||
| Edward Waldo Forbes (1873-1969) | |||
| Waldo Emerson Forbes (1879-1917) | 28 February 1879 Milton, Norfolk County, Massachusetts, United States | 17 June 1917 Milton, Norfolk County, Massachusetts, United States | Ellen Forbes (1886-1954) |
| Ellen Randolph Forbes (1880-1881) | |||
| Alexander Forbes (1882-1965) | |||
Siblings
| Name | Birth | Death | Joined with |
| Alice Hathaway Forbes (1838-1917) | |||
| Ellen Randolph Forbes (1838-1860) | |||
| William Hathaway Forbes (1840-1897) | 1 November 1840 | 11 October 1897 | Edith Emerson (1841-1929) |
| Mary Hathaway Forbes (1844-1916) | |||
| John Malcolm Forbes (1847-1904) | 2 February 1847 Milton, Norfolk County, Massachusetts, United States | 19 February 1904 Milton, Norfolk County, Massachusetts, United States | Sarah Coffin Jones (1852-1891) Rose Hickling Dabney (1864-1947) |
| Sarah Forbes (1853-1917) | |||
Residences
Footnotes (including sources)
| ‡ General |