Marcus Blog was a son of Levie Blog and Sara van Collem. He married Schoontje Hekster in Amsterdam on 12 September 1917, a daughter of Philip Hekster and Jansje Turfrijer.
His siblings Rachel, Samuel, David, Elizabeth, Jacob and Debora have been killed too in the Holocaust.
City Archive of Amsterdam, archive card of Levie Blog and website www.wiewaswie.nl.