Mozes van Cleef was a son of Simon van Cleef and Judith Polak. He married 10 September 1929 in Amasterdam to Duifje Boesnach, a daughter of Asser Boesnach and Sara Witteboon.
His siblings, who have been killed also during the Holocaust were Abraham, Doortje, Rebecca and Joseph.
City Archive of Amsterdam, archive card of Simon van Cleef and website www.wiewaswie.nl.