 Monrad was the son of Carl Alexander Metzgen, the former Auditor General (1911) of Belize, British Honduras.Metzgen's mother, Esther Almira Bevans (born on 17 January 1869 in Belize and died 1944), was the second wife of his father (the first one was Estelle Greene).His father, Carl Alexander Metzgen (born on 24 July 1860 and killed in Petén on 13 March 1930).