| Father | Julius Ernst Zank (1853 - 1923) |
| Mother | Amelia Fredericke Wiegand (1855 - 1930) |
| Sibling | Albert Ewald Zank (1879 - 1937) |
| Sibling | Wilhelmine Louise Zank (1881 - 1955) |
| Sibling | Emma Theresa Zank (1883 - 1980) |
| Sibling | Martha Henrietta Zank (1886 - 1955) |
| Sibling | Herman Julius Zank (1888 - 1975) |
| Sibling | Otto August Zank (1889 - 1970) |
| Sibling | Ferdinand Wilhelm Zank (1891 - 1957) |
| Sibling | Walter Erich Zank (1894 - 1970) |
| Sibling | Johannes Friedrich "John" Zank (1896 - 1980) |
| Sibling | Erwin Adolph Zank (1899 - 1982) |
| Sibling | Rohland Bernhard Zank (1900 - 1971) |