Nicholas married Ellen Louisa Poulton on 3 Apr 1894 in Belmont County, Ohio, USA. Ellen (daughter of Henry Andrew Poulton and Mary E. Levis Reischman) was born on 16 Aug 1874 in Temperanceville, Belmont County, Ohio, USA; died on 17 Apr 1950 in Belmont County, Ohio, USA. [Group Sheet] [Family Chart]

1. Edward Raphael Slevin was born on 1 Feb 1895 in Temperanceville, Belmont County, Ohio, USA; died on 6 Oct 1967 in Ohio, USA.
2. Clara Bernice Slevin was born on 17 Apr 1901 in Belmont County, Ohio, USA; died on 5 Aug 1966 in Pennsylvania, USA.
3. Mary Lucy Slevin was born on 30 Aug 1903 in Ohio, USA; died on 30 Jun 1935 in Ellwood City, Lawrence County, Pennsylvania, USA; was buried in Holy Redeemer Cemetery, North Sewickley Township, Beaver County, Pennsylvania, USA.
4. Henry Slevin was born on 4 Apr 1907 in Temperanceville, Belmont County, Ohio, USA; died on 22 Feb 1963 in Pennsylvania, USA; was buried in Holy Redeemer Cemetery, North Sewickley Township, Beaver County, Pennsylvania, USA.
5. Patrick C. Slevin was born on 21 Oct 1911 in Temperanceville, Belmont County, Ohio, USA; died on 11 Jun 1982 in Idaho, USA.
6. Teresa Loretta Slevin was born on 6 Aug 1915 in Temperanceville, Belmont County, Ohio, USA; died on 23 Oct 1936 in Akron, Summit County, Ohio, USA.
7. Michael Roger Slevin was born on 7 Jun 1917 in Temperanceville, Belmont County, Ohio, USA; died on 27 Oct 1986 in Lorain, Lorain County, Ohio, USA; was buried in Saint Mary's Cemetery, Batesville, Noble County, Ohio, USA.
8. Roberta Bridget Slevin was born on 7 Jun 1917 in Temperanceville, Belmont County, Ohio, USA; died on 21 Nov 1986 in Vermilion, Erie County, Ohio, USA; was buried in Maple Grove Cemetery, Vermilion, Erie County, Ohio, USA.