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Son of Cornelis Schelto Sixma, Baron van Heemstra and Johanna Arnolda Bernardina, Gravin Schimmelpenninck Husband of Theodora Elisabeth Barones van Heemstra Father of Age Cornelis Schelto Sixma van Heemstra Brother of Flyo Schelto Sixma van Heemstra; Philippina Roberta Sixma van Heemstra and Hector Livius Sixma van Heemstra
http://genealogics.org/getperson.php?personID=I00162717&tree=LEO