Francis married Catherine Grentzinger on 9 Apr 1862 in Rochester, Monroe County, New York, USA. Catherine (daughter of Franz Joseph Grentzinger and Magdalena Hänlin) was born on 8 Sep 1843 in Irondequoit, Monroe County, New York, USA; died on 7 Mar 1924 in Rochester, Monroe County, New York, USA; was buried on 10 Mar 1924 in Holy Sepulchre Cemetery, Rochester, Monroe County, New York, USA. [Group Sheet] [Family Chart]

1. Gilbert Andrew Costich was born on 3 May 1863 in Irondequoit, Monroe County, New York, USA; died on 4 Jul 1944 in Rochester, Monroe County, New York, USA.
2. Joseph Costich was born in 1864 in Irondequoit, Monroe County, New York, USA.
3. Sephraine Costich was born on 4 Sep 1865 in Irondequoit, Monroe County, New York, USA.
4. Mary Louisa Costich was born on 28 Oct 1867 in Irondequoit, Monroe County, New York, USA; died on 30 May 1931 in Webster, Monroe County, New York, USA.
5. Bernard G. Costich was born on 3 Apr 1871 in Irondequoit, Monroe County, New York, USA; died in in Rochester, Monroe County, New York, USA.
6. Richard Francis Costich was born on 31 Jan 1874 in Irondequoit, Monroe County, New York, USA; died on 24 May 1958 in Irondequoit, Monroe County, New York, USA.
7. Stephan Costich was born on 18 Jan 1878 in Irondequoit, Monroe County, New York, USA.
8. Edward Costich was born on 24 Jun 1880 in Irondequoit, Monroe County, New York, USA; died on 8 Oct 1938 in Irondequoit, Monroe County, New York, USA.
9. Clara Elizabeth Costich was born on 17 Jul 1882 in Irondequoit, Monroe County, New York, USA.
10. Oliver Urban Costich was born on 28 Sep 1887 in Irondequoit, Monroe County, New York, USA.

Franz married Maria Johanna Dizard on 11 Jan 1819 in Bern, Kanton Bern, Schweiz. Maria was born on 4 Feb 1794 in Bern, Kanton Bern, Schweiz; died on 16 Mar 1883 in Irondequoit, Monroe County, New York, USA. [Group Sheet] [Family Chart]