A. Blömer, Die reformierte Familie Gietmann (Gethmann) aus Monheim und Hilden, Mönchengladbach 1996, S. 24, 28, 30
__ | __|__ | ________________________| __ | | | | |__|__ | Johannes HALFMANN | __ | (....-1707)x1666 | | | | __|__ | | | | |________________________| __ | | | | |__|__ |--Diedrich HALFMANN | (1680-1718)x1707 __ | | | __|__ | | | Diedrich CLEVENHAUS | __ | | (....-1679)x1645 | | | | |__|__ | | | Elisabeth CLEVENHAUS | __ (1645-1707)x1666 | | | __|__ | | | Katharina im SCHWANEN | __ (1620-1678)x1645 | | |__|__