| Father | Anton Langsdorf (1856 - 1934) |
| Mother | Maria Catharina Matheisen (1863 - 1947) |
| Sibling | John W Langsdorf (1880 - 1954) |
| Sibling | Henry John Langsdorf (1881 - 1955) |
| Sibling | George C. Langsdorf (1883 - 1953) |
| Sibling | Theodore Charles Langsdorf (1885 - 1960) |
| Sibling | Anton August Langsdorf (1886 - 1954) |
| Sibling | William Herman Langsdorf (1888 - 1981) |
| Sibling | Catherine M "Katie" Langsdorf (1890 - 1958) |
| Sibling | Mary Langsdorf (1892 - 1967) |
| Sibling | Frank Langsdorf (1895 - 1895) |
| Sibling | Margaret Christine Langsdorf (1897 - 1978) |
| Sibling | Ella Cecelia Langsdorf (1901 - 1990) |