Charles Gesner van der Voort (1916-1991) worked for Holland-China Trading Company in Shanghai, from 1939 to 1943.
Franciscus Hubertus Joseph Alphonsus Lafleur (1890 - 1946) was a colleague at the Hong Kong office and lived in Hong Kong with his wife Lily (1907-1982), son Ah Tong and daughter Ah Kan (Mary). The Japanese interned the family in Stanley Camp, Hong Kong. Unfortunately, Franciscus (probably people called him Frans) died soon after WWII.
Gwulo.com member annpake found information about Lily Lafleur. A.o. that she sailed from Hong Kong to London in December 1951. Via LinkedIn I found the granddaughter and son of the man in the photo: Johnny (Johannes Anthonius Maria) Lafleur (1918-2006), Frans' younger brother. His son wrote me that his parents were visited by Lily, some years after WWII. A photo was made, which at first was no longer to be found, and then ... it was found after all!
Courtesy Lafleur family archives