Family: Frederik Jefsen / Karen Margrethe Nielsen (F1777)
m. 1 Apr 1928 | Otto Nielsen (1875-1961) 
|
 | Bothilde Caroline Jacobsen (1874-1943)
|
Ingeborg Cathrine Nielsen (1898-1977)  |
| Dorthea Marie Nielsen (1900-1984) |
 | Hanna Christine Nielsen (1903-1983) |
| Anna Petrea Nielsen (1905-1986) |
| Niels Jacob Nielsen (1906-1987) |
 | Peter Theodor Nielsen (1907-1999) |
| Otto Nielsen (1909-1990) |
| Bothilde Nielsen (1913- ) |
| Karen Margrethe Nielsen (1901-1994)
|
| Frederik Jefsen (1899-1971)
|
| Mette Kjerstine Jefsen (1931- ) |
| Lis Bodil Jefsen (1935- ) |