Cornelia Polak was a daughter of Jonas Mozes Polak from Zwolle and Dina Marsman from Oegstgeest. She married 4 May 1905 the widower of Elisabeth Spiro from Geldern (Germany), (born 7 September 1853 - died in Amsterdam 2 November 1903), Mozes Philips van Buren, musician, a not legalized natural son of Carolina Philips. From the marriage of Cornelia Polak and Mozes Philips van Buren a son was born i…