| 1. | Frank Costello was born about 1880 in California; and died. Family/Spouse: Grace M. Blacklock. Grace (daughter of Walter Blacklock and Mary Gormley) was born about 1882 in California; and died. [Group Sheet] [Family Chart]
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| 2. | Mary Frances Costello Family/Spouse: Edwin McInnis. Edwin and died. [Group Sheet] [Family Chart] |
| 3. | Leland Costello |
| 4. | Robert W. Costello |
| 5. | John Costello |