| Father | Michael Francis Costigan (1907 - 1984) |
| Mother | Bridget Keating ( - 1984) |
| Sibling | Sam Costigan (1927 - 2001) |
| Sibling | Mary Costigan ( - 2001) |
| Sibling | Lorraine Costigan ( - ) |
| Sibling | Helen Costigan ( - ) |
| Sibling | Marie Costigan ( - ) |
| Sibling | Linda Costigan ( - ) |
| Sibling | Margaret Costigan ( - ) |
| Sibling | Bernice Costigan ( - ) |
| Sibling | Martha Costigan ( - ) |
| Sibling | Nancy Costigan ( - ) |
| Sibling | Joseph Costigan ( - ) |
| Sibling | Michael Costigan ( - ) |
| Sibling | Brian Costigan ( - ) |
| Sibling | John Glen Costigan ( - ) |
| Sibling | Thomas Costigan ( - ) |