Isaac married Elisabeth Cathrine Nissen on 22 Nov 1747 in København, Denmark. Elisabeth was born on 06 Oct 1717 in København, Denmark; died on 02 Apr 1751 in Sorø, Denmark. [Group Sheet] [Family Chart]

Isaac married Magdalene Thestrup on 05 Apr 1752 in København, Denmark. Magdalene (daughter of Christian Frandsen Thestrup and Karen Larsen Fogh) was born in 1732 in København, Denmark; died in 1754 in Sorø, Denmark; was buried on 16 Feb 1754 in Sorø, Denmark. [Group Sheet] [Family Chart]

Isaac married Anna Sofie Baar on 19 Sep 1755 in Odense, Fyn, Denmark. Anna was born about 1725 in Odense, Fyn, Denmark; died on 05 May 1783 in Hurum, Norway. [Group Sheet] [Family Chart]