Joseph married Julia Anna Mason on 12 Oct 1879 in Jackson County, Wisconsin, USA. Julia was born on 5 Apr 1858 in Vermont, USA; died on 18 Jan 1929 in Codington County, South Dakota, USA; was buried in Bryant, Hamlin County, South Dakota, USA. [Group Sheet] [Family Chart]

1. Hatti Horswill was born in Aug 1882 in Wisconsin, USA.
2. Elva Horswill was born in Oct 1884 in South Dakota, USA.
3. Jessie W Horswill was born about 1888 in South Dakota, USA.
4. Guy Raymond Horswill was born on 13 Jun 1890 in Bryant, Hamlin County, South Dakota, USA.
5. Ralph E Horswill was born about 1891 in South Dakota, USA.
6. Rauf Horswill was born in Sep 1891 in South Dakota, USA.
7. Philip J Horswill was born on 19 Sep 1894 in South Dakota, USA; died on 21 Oct 1978 in Deer Lodge, Powell County, Montana, USA; was buried in Deer Lodge, Powell County, Montana, USA.
8. Pearl B Horswill was born in Apr 1898 in South Dakota, USA.
9. Ethel Bernice Horswill was born on 12 Sep 1901 in South Dakota, USA.