R.M. Snethlage, Stammliste der Familie Engels aus Wülfrath, Aachen 1973, S. 53
__ | _____________________|__ | Johannes KALTHOFF | __ | x1695 | | | |_____________________|__ | Gerhard KALTHOFF | __ | (1705-....)x1728 | | | | _____________________|__ | | | | | Christina WILLSTOCK | __ | x1695 | | | |_____________________|__ |--Christina KALTHOFF | (1729-1794)x1750 __ | | | _____________________|__ | | | Hermann KEYMER | __ | | x1699 | | | | |_____________________|__ | | | Anna Christina KEYMER | __ (1704-1788)x1728 | | | Johann BRINK |__ | | x1677 | Ursula BRINK | __ (1677-....)x1699 | | | Katharina WÜSTHOFF |__ x1677