Mietje de Brave was a daughter of Philip Abraham de Brave and Saartje Joseph van Baalen. She married Gideon Polak in 1873 in Amsterdam. He passed away in 1931. Besides the two children mentioned here, they had a daughter Lea who passed away in 1935 and a daughter Jeannette.
Stadsarchief Amsterdam, archiefkaart Mietje de Brave