Family with parents
father Parents Henricus Franciscus JosephusSijses Maria Margarethaten Berge	Rudolphus Antonius AmbrosiusSijses 1854–1921
mother Parents Petrus JohannesMiljoen Margaretha AlidaDriesens	Anna MargarethaMiljoen 1859–1909
elder sister Family (none)	NNSijses 1886–1886
elder sister Family EgbertPultrum AnnaSijses Henderikus JohannesSijses	Margaretha AlidaSijses 1888–1935
elder sister Family (none)	Hendrika Francisca JosephaSijses 1889–1890
elder brother Family Carolina JohannaSplit Rudolph Antonius AmbrosiusSijses Ida Wilhelmina ClasinaSijses Private	Henricus JohannesSijses 1890–1967
elder sister Family JacobKooistra Private	Wilhelmina HarmannaSijses 1895–1982
elder sister Family (none)	Gerritdina JohannaSijses 1896–1918
herself Family FrederikHuizinga	Helena CatharinaSijses 1898–1953
younger brother Family (none)	Rudolphus Antonius AmbrosiusSijses 1901–1901
Father’s family with MariaMaurits
father Parents Henricus Franciscus JosephusSijses Maria Margarethaten Berge	Rudolphus Antonius AmbrosiusSijses 1854–1921
step-mother Parents Berend BerendsMaurits Antje BerendsSchakelaar	MariaMaurits 1855–1885
half-sister Family Hindrik JanDoff FreerkDoff Maria AkinaDoff JanDoff Private Private	Maria MargarethaSijses 1883–1960
half-sister Family (none)	NNSijses 1885–1885
Family with FrederikHuizinga
husband Parents HermannusHuizinga AnnaTerpstra	FrederikHuizinga