| Father | Frank William Terhaar (1860 - 1932) |
| Mother | Anna Marie Zierden (1868 - 1953) |
| Sibling | Maria Terhaar (1889 - 1966) |
| Sibling | Apollonia Agnes Terhaar (1891 - 1990) |
| Sibling | Peter William Terhaar (1895 - 1968) |
| Sibling | Casper Joseph Terhaar (1897 - 1965) |
| Sibling | Sebastian Terhaar (1899 - 1968) |
| Sibling | Anthony Terhaar (1902 - 1986) |
| Sibling | Loretta Terhaar (1904 - 1985) |
| Sibling | Martina Terhaar (1906 - 1989) |
| Sibling | Veronica Elizabeth Terhaar (1908 - 2000) |
| Sibling | Raymond J. Terhaar (1910 - 1991) |
| Sibling | Florentina Terhaar (1913 - 1930) |
| Sibling | Frank Wilhelm Broddesser (1914 - 1986) |