Hans Kramers is flanked by his wife Anna and his daughter Agnete (20 years old). To the left of Anna is Paul Ehrenfest's widow, Tatiana Ehrenfest-Afanassjewa (with shawl) and his other two daughters, Suus (23) and Martine (15). Son Jan (10) is missing, he was likely too young to attend. 
Front row, from left to right, Grethe Kronig-Petersen (kneeling), Ralph Kronig, Henk Casimir, Frederik Belinfante. Next row, far left, Martine Kramers (in front of Jan Ketelaar, with glasses), Suus Kramers, Tatiana Ehrenfest-Afanassjewa, Anna Kramers-Petersen, Hans Kramers, Agnete Kramers, Eliza Wiersma (with glasses), Joost van den Handel, Jeanne Kramers-Engels (with hand bag, sister-in-law of H.A.K.), Leon Rosenfeld, Jan de Boer.
Source: H.A. Kramers family archive, maintained by grandson Koos Kuiper, who informed me of the unusual location: While originally the reception was to be in the Kamerlingh Onnes laboratory, this had been requisitioned by the German occupation. Hans' brother Jan was professor of Arabic, and it is likely that his contacts enabled the move to the Oriental Institute.
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