A. Blömer, Ahnenliste des Gerd Langer aus Rheydt, Mönchengladbach 1983, S. 13
__ | ______________________|__ | Johannes DOHR | __ | x1676 | | | |______________________|__ | Servatius DOHR | __ | (1690-1727)x1713 | | | | ______________________|__ | | | | | Adelheid GEHLEN | __ | (1650-1739)x1676 | | | |______________________|__ |--Katharina DOHR | (1721-1766)x1741 __ | | | Heinrich KNÖPKES |__ | | (....-1687) | Johann KNÖPKES | __ | | x1687 | | | | | Adelheid |__ | | | Adelheid FELDGES | __ (1687-1727)x1713 | | | Matthias STEINRATHS |__ | | (....-1706) | Katharina FELDGES | __ x1687 | | | Agnes FELDGES |__ (....-1687)