Parents

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Jacobus Cornelis Kapteyn grad student 1901 RUG
 (Discussion of heliometer observations of Jupiter's satellites)

Children

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Jan Woltjer grad student 1918 Leiden
Willem Hendrik van den Bos grad student 1925 Leiden
Dirk Brouwer grad student 1927 Leiden
Simon C. van Veen grad student 1927 Leiden (Physics Tree)