Belnart van der Sluis was a son of Elias van der Sluis and Sara Frank. He was born on 27 October 1890 in Vlijmen in North Brabant and he was a traveler in bakery products. On 14 December 1922, he married Serlina Salomons in Amsterdam, a daughter of Meijer Salomons and Bloeme de Paauw, who was born on 20 September 1889 at Rapenburgerstraat 165 in Amsterdam.
On 9 September 1901, the van der Sluis f…