Family with parents
father Parents Heinrich Friedrich WilhelmWittrock Meta GesinaHappe	Carl Heinrich FriedrichWittrock 1856–1934
mother Parents Albertusvan den Bosch Dirkjevan der Meijden	Herminavan den Bosch 1870–1943
herself Family Johannes HendrikusBielevelt	HerminaWittrock 1897–1918
younger sister Family Johan BernardNacken Private	HenniWittrock 1898–1975
younger sister Family (none)	FredriekaWittrock