| Jakob (Jake) Dirks Ulferts (1859 - 1947) |
Robe (Robert) Casjens Mammen (1862 - ) |
| Jennie (Janna) Janssen Maas (1858 - 1939) |
Stella Mammenga (1856 - 1931) |
| Jacob Ulferts4 | Janne Mamenga4 |
 b. 1892d. 1966, Ogle Co IL bur. Ebenezer Reformed Church occ. bp. |
 b. 1886d. 1923, Ogle Co IL bur. Ebenezer Reformed Church occ. bp. |
| spouses: 1, 2 | spouses: 1, 2 |
Children
| Jacob Henry Ulferts [Twin] Robert Ulferts [Twin] |