Jakob married Maria Katharina Gruber on 30 Oct 1886 in Leonberg (Lwowek), Gostynin, Warszawskiego, Polska. Maria (daughter of David Gruber and Anna Frederike Anselm) was born on 29 May 1865 in Leonberg (Lwowek), Gostynin, Warszawskiego, Polska; died on 16 Dec 1938 in Klodtken. [Group Sheet] [Family Chart]