Parents

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Willem de Sitter research assistant 1946 Leiden
Ejnar Hertzsprung research assistant 1946 Leiden
Jan Hendrik Oort research assistant 1946 Leiden
Pieter Johannes van Rhijn grad student 1946 RUG
 (A study of the Scorpio-Centaurus cluster)
Otto Struve post-doc 1947-1948 Yerkes Observatory

Children

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Maarten Schmidt research assistant 1949-1956 Leiden (Physics Tree)
Hugo van Woerden grad student 1962 RUG
Tjeerd Sicco van Albada grad student 1968 RUG