The artist Louis Polak, son of David Polak and Sara Franschman, married Frouwke van der Bijl, daughter of Emanuel van der Bijl and Emma Swart (deceased in 1927), on 10 June 1942. Louis and Frouwke did not have children.
Copies of the birth certificate of Frouwke van der Bijl and of the marriage certificate of Louis Polak and Frouwke van der Bijl remain from the couple.