Two brothers and two sisters lived in the house at Kerkstraat B66 in Muntendam, all four unmarried and all four children of Jonas Filippus Valk and Jetta Levitus. Jonas died in 1928 but Jetta already died in 1905. They had a total of six children, two of whom survived the Holocaust: Jakob died in 1956 in The Hague and Hartoch in 1982 in Haren.
Filippus was the eldest of the other four children, who fell victim to the Nazis. He was usually called Lips and was born on 7 June 1979. His brother Izak, who was born on 22 January 1882, followed next. Both worked in the butcher shop of Hartoch Levitus, a brother of Jetta Levitus, who was also located in Kerkstraat, Filippus as a horse butcher and Izak as a butcher's servant.
Both sisters took care of the household in the parental home, but they also assisted in the sale of meat in the butcher shop. Rebekka was born on 16 February 1885 and Roosje on 2 June 1890. Beside working as a butcher’s servant at Levitus, Izak was also a dealer in irregular goods: he traded in scrap iron, in rags but also in animal pelts, just like his father Jonas.
On the evening of 11 November 1942, the Valk brothers and sisters were forcibly arrested in their parental home and carried off to Westerbork, where they were registered on 12 November. On 20 November, the four of them, along with 722 other deportees, were put on transport to Auschwitz, where on arrival on 23 November 1943, they were immediately killed in the gas chambers of Auschwitz-Birkenau.
Sources including the website Allegroningers.nl/births Muntendam; the file cabinet of the Jewish Council, registration cards of Filippus Valk, Izak Valk, Rebekka Valk and Roosje Valk; the book Open Joodse Huizen (Jewish Homes) part 2, page 83-89 by Else Valk; the Wikipedia listing of Jewtransports from the Netherlands.nl and additions of visitors of the website.