Family: William J. Brennan / Elizabeth J. Hayes (F1738)
m. 1898Martin Brennan (1827-1879) 
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Mary Fitzgerald (1833-1903)
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| Michael Brennan (1859- ) |
Patrick H. Brennan (1862-1937)  |
| Martin H. Brennan (1865- ) |
| Mary Alice Brennan (1866-1902) |
| John Brennan (1867-1945) |
| Martin Brennan (1873-1947) |
| Elizabeth Brennan (1879-1972) |
| Michael Hayes (1824-1872) |
| Bridget Gallagher (1841-1906) |
| William J. Brennan (1870-1925)
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| Elizabeth J. Hayes (1877-1960)
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| Michael Joseph Brennan (1900-1972) |
| Francis Martin Brennan (1902-1932) |
| William Harold Brennan (1904-1986) |
| Mary Teresa Brennan (1906-1982) |
| Clarence Anthony Brennan (1907-1997) |
| William James Brennan (1910-1996) |
| Eileen Elizabeth Brennan (1914-2003) |
| Donald Hayes Brennan (1918-1996) |