Family: John Patrick Grennan / Pauline E. Zinker (F952)
Michael Joseph Grennan (1870-1926) 
|
 | Mary Ellen Galvin (1865-1951)
|
Michael Joseph Grennan (1898-1989)  |
| Mary Catherine Grennan (1899-1900) |
 | Delia M. Grennan (1901-1987) |
| Ann Ellen Grennan (1903-1991) |
| William Thomas Grennan (1906-1953) |
 | Pauline E. Zinker (1897-1931) |
 | John Patrick Grennan (1894-1965)
|
 | John Patrick Grennan, Jr. (1921-2007) |
| Anna Mae Grennan (1924- ) |
| Paul Francis Grennan (1930-2010) |