| Name | John Costello | |
| Birth | 1916 | |
| Gender | Male | |
| Death | Yes, date unknown | |
| Person ID | I1414 | CCBasic |
| Last Modified | 16 Jan 2021 | |
| Father | Frank Costello, b. Abt 1880, California d. Yes, date unknown | |
| Mother | Grace M. Blacklock, b. Abt 1882, California d. Yes, date unknown | |
| Family ID | F508 | Group Sheet | Family Chart |