William married Jane Sparkhall on 13 Feb 1843 in Toronto, ON, Canada. Jane (daughter of Cubitt Sparkhall, I and Mary Worts) was born on 8 Jun 1820 in Neatishead, Ashmanhaugh, Norfolk, England, UK; died on 3 Feb 1899 in New Westminster, BC, Canada; was buried in Fraser Cemetery, New Westminster, BC, Canada. [Group Sheet] [Family Chart]

1. George Cubitt Clarkson was born in c. 1843; died on 15 May 1877 in New Westminster, BC, Canada.
2. Hannah Maria Clarkson was born on 17 Aug 1845; died on 30 Sep 1910 in New Westminster, BC, Canada; was buried in Fraser Cemetery, New Westminster, BC, Canada.
3. Sarah Jane Clarkson was born on 21 Mar 1847 in E.Flamboro Gore Twp, ON, Canada; died on 9 Jul 1925 in New Westminster, BC, Canada; was buried in Fraser Cemetery, New Westminster, BC, Canada.
4. Mary Elizabeth Clarkson was born on 3 Jan 1849 in Waterdown, ON, Canada; died on 9 Oct 1903 in New Westminster, BC, Canada; was buried in Fraser Cemetery, New Westminster, BC, Canada.
5. Kate Eleanor Clarkson was born on 12 Jul 1850 in Oshawa, ON, Canada; died on 15 Oct 1937 in New Westminster, BC, Canada; was buried in Fraser Cemetery, New Westminster, BC, Canada.
6. William Clarkson was born in Jan 1852 in Whitby, ON, Canada; died on 1 Aug 1855 in Oshawa, ON, Canada; was buried in 1855 in Oshawa Pioneer Cemetery, Oshawa, ON, Canada.
7. Henrietta Clarkson was born in Apr 1854; died in Jul 1854 in Oshawa, ON, Canada; was buried in Oshawa Pioneer Cemetery, Oshawa, ON, Canada.
8. Harriett Clarkson was born on 7 Sep 1855 in Oshawa, ON, Canada; died on 18 Dec 1917 in New Westminster, BC, Canada; was buried in 1917 in Fraser Cemetery, New Westminster, BC, Canada.