Family with parents
mother Parents HendrikSlotboom Aaltjevan Heerd	AdrianaSlotboom 1858–1914
himself Family (none)	HendrikSlotboom 1884–1884
Mother’s family with RoelofBeijer
step-father Parents (unknown)	RoelofBeijer 1861–1932
mother Parents HendrikSlotboom Aaltjevan Heerd	AdrianaSlotboom 1858–1914
half-brother Family TheodoraKersten	RudolfBeijer