Maria van der Kolk (1867- ) 
|
| Neeltje Letterman (1886-1886) |
Meeuwis Letterman (1888-1888) |
| Neeltje Letterman (1889-1889) |
| Anthonie Letterman (1890-1891) |
Neeltje Letterman (1891-1931)  |
| Anthonie Letterman (1892-1893) |
| Jaapje Letterman (1893-1894) |
| Anthonie Letterman (1895-1898) |
| Meeuwis Letterman (1897- ) |
| Adriana Letterman (1898- ) |
| Anthonie Letterman (1899-1899) |
| Anthonie Letterman (1900-1901) |
| Anthonie Letterman (1902-1959) |
| Willemina Letterman (1904- ) |
| Maria Letterman (1887-1962)
|
| Detje Koogje (1909-1991) |
| Willem Koogje (1911- ) |
