Genealogie familie Willemsen
Genealogie van o.a. de Familie Willemsen, Dicks, van Londen, Holkamp, versijp
Gezin: Roelof Dercksen / Gerharda jansen Aelberts (F1718133184)
 | Theodora Derris Arentse (1615- ) |
| Jantjen Dercksen (1645- )  |
 | Roelof Dercksen (1650- ) 
|
| Theodora Roelofs Dercksen (1675- ) |
| Jantjen Roelofs Dercksen (1678- ) |
| Lucas Roelofs Dercksen (1681- ) |
| Gerritjen Roelofs Dercksen (1685- ) |
| Albertus Roelofs Dercksen (1688- ) |