Sientje de Leeuw, born in 1884 in Steenwijk, was a daughter of the butcher Jacob Israel de Leeuw and Judith Rosenbach. 21 June 1911 she married in Steenwijk the travelling salesman in paper Elkan Kosman, a son of the travelling saesman Izak Kosman and Rosetta Rosenbach. The couple had two daughters,…