Parents

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Hendricus Gerardus van de Sande Bakhuijzen grad student 1902 Leiden
 (Untersuchungen über den lichtwechsel Algols)

Children

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Gijsbert van Herk research assistant 1930 Amsterdam
Sijtze Verweij grad student 1936 Amsterdam
Thèodore Walraven grad student 1948 Amsterdam
David Koelbloed grad student 1953 Amsterdam