John Patrick Grennan |
| Born | 8 Jun 1894 | Ardmore, PA, US |
| Died | 12 Dec 1965 | Bristol, CT, US |
| Buried | St. Joseph Cemetery, Bristol, CT, US |
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| Married | ||
| Other Spouse | Pauline E. Zinker | F952 | |
| Married | ||
| Father | Michael Joseph Grennan | F890 Group Sheet | |
| Mother | Mary Ellen Galvin | F890 Group Sheet | |