Andreas married Ingeborg Kristine Sofie Demant on 26 Feb 1851 in Dalum Kirke, Odense, Denmark. Ingeborg (daughter of Peter Ulrik Frederik Demant and Laudine Ludovica Schroeter) was born on 29 Feb 1828 in Dalum Mølle, Odense, Denmark. [Group Sheet] [Family Chart]

1. Frederik Ludvig Demant Westergaard was born on 17 Apr 1852 in Dalum Mølle, Odense, Denmark.
2. Thorvald Hugo Kristian Westergaard was born on 28 Feb 1854; died on 24 May 1862 in Flensburg, Germany.
3. Vilhelm Westergaard was born on 16 Nov 1855 in Flensburg, Germany.
4. Albert Werner Westergaard was born on 23 Oct 1857 in Flensburg, Germany.
5. Svend Volmer Westergaard was born on 02 Sep 1859 in Flensburg, Germany.
6. Rolf Westergaard was born on 22 Dec 1860 in Flensburg, Germany.
7. Thuride Kristine Westergaard was born on 02 Feb 1863 in Flensburg, Germany.
8. Niels Westergaard was born on 05 May 1865 in Odense, Fyn, Denmark.
9. Otto Achton Westergaard was born on 25 Jul 1867 in Fredericia, Vejle, Denmark.
10. Ingeborg Westergaard was born on 09 Jan 1870 in Fredericia, Vejle, Denmark.
11. Margrete Westergaard was born on 13 Jun 1872 in Fredericia, Vejle, Denmark; died on 04 Sep 1875 in Fredericia, Vejle, Denmark.