Family with parents
father Parents (unknown)	Johannes MartensSijtsema 1835–1905
mother Parents (unknown)	AlberdinaJongbloed 1844–1920
elder brother Family (none)	Marten WillemSijtsema 1872–1908
himself Family AkkeBijlsma Johannes Marten“Joop” Sijtsema Cornelis JacobSijtsema Gerardina Johanna“Dien” Sijses Private	Hendrik JohannesSijtsema 1889–1932
Family with AkkeBijlsma
himself Parents Johannes MartensSijtsema AlberdinaJongbloed	Hendrik JohannesSijtsema 1889–1932
wife Parents (unknown)	AkkeBijlsma 1890–1920
son Family (none)	Johannes Marten“Joop” Sijtsema