Samuel married Jane McNaul on 9 Dec 1862 in Clogherny, Tyrone, Ireland. Jane (daughter of William McNaul and Ann - married William McNaul -) was born in 1839 in Kilnaheery Townland, County Tyrone, Ireland; died on 16 Oct 1894 in Oshawa, Ontario, Ontario, Canada. [Group Sheet] [Family Chart]

1. Samuel Johnston was born on 15 May 1865 in Whitby Township, Ontario, Ontario, Canada; died on 5 Mar 1943 in 1225, Simcoe Street, Oshawa, Ontario, Ontario, Canada; was buried on 10 Mar 1943 in Oshawa, Ontario, Ontario, Canada.
2. Rebecca Jane Johnston was born on 20 Sep 1866 in East, Whitby, Durham, Ontario, Canada; died on 12 Sep 1934 in Oshawa, Ontario, Canada.
3. John Johnston was born on 8 Jul 1867 in East Whitby Township, Ontario, Ontario, Canada; died on 14 Feb 1964 in 99 King Street, Lindsay, Victoria, Ontario, Canada.
4. Henrietta Johnston was born in 1870 in Canada; died on 12 Dec 1872 in Ontario, Ontario, Canada.
5. Jessie J Johnston was born on 8 May 1872 in Ontario; died on 29 Jan 1964 in Oshawa, Durham Regional Municipality, Ontario, Canada.
6. Alena May - Lena - Johnston was born in 1874 in Whitby, Ontario; died on 2 May 1903 in Victoria County, Ontario, Canada.