Im Jahr des Hauskaufes (1840) heiratete Magnus Bertha Humblot, Tochter des Berliner Verlegers Pierre Humblot (Duncker & Humblot) aus hugenottischer Familie. ###>He married in 1840 Bertha Humblot, of a French Huguenot family settled in Berlin, by whom he left a son and two daughters.