Parents

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Jacobus Cornelis Kapteyn grad student 1915 RUG
 (Derivation of the change of colour with distance and apparent magnitude together with a new determination of the mean parallaxes of the stars with given magnitude and proper motion)

Children

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Egbert Adriaan Kreiken grad student 1923 RUG
Jan Schilt grad student 1924 RUG
Jan Hendrik Oort grad student 1926 RUG
Peter van de Kamp grad student 1926 RUG
Bart J. Bok grad student 1932 RUG
Adriaan Blaauw grad student 1946 RUG