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Our grandfather, Jan/Johannes Bul, was a resistance fighter during the war. One of his couriers was Elly Romijn. Elly is the younger sister of artist Gust Romijn.
During the war, Elly lived on the Randweg near our grandparents in South Rotterdam, and she quickly developed a close bond. Elly visited our grandparents to celebrate our grandmother's birthday, just after the liberation on May 17, 1945. The birthday was also attended by liberating Canadian soldiers, with whom Elly quickly seemed to fall in love. Our grandparents protected Elly during that time to prevent any impulsive actions on her part.
After the war, Elly wanted to thank our grandfather for his help during and after the war, so she asked her brother Gust Romijn to make a drawing for him. Gust was also involved in the resistance.
Our aunt seems to remember that the drawing was given the name 'The Family'.
After our grandparents passed away, the drawing came into the possession of our parents, who have since also passed away. We now have the drawing.
We've contacted Gust Romijn's estate, who confirmed that this is indeed an early work by the artist. Although the signature on the drawing isn't the same as on his later work, one of the figures in the drawing matches a person from the family photo album.