C. Pick, Familienbuch Lennep 1654-1809, Plaidt 2014, S. 220
__ | Engelbert BERTRAM |__ | (....-1661)x1637 Peter BERTRAM | __ | (1637-1712)x1661 | | | | N. |__ | x1637 Peter BERTRAM | __ | (1666-1741)x1726 | | | | Engelbert HASSELKUS |__ | | | (....-1667)x1635 | | Margaretha HASSELKUS | __ | (1635-1682)x1661 | | | | N. |__ | x1635 |--Peter BERTRAM | (1731-1804)x1756 __ | | | ______________________|__ | | | _______________________| __ | | | | | | |______________________|__ | | | Christina ZILLES | __ (1695-1759)x1726 | | | ______________________|__ | | |_______________________| __ | | |______________________|__