William married Mary Jane SHIELDS in 1847 in Belfast, Co. Antrim, Ireland. Mary (daughter of William SHIELDS and Agnes JEFFREY) was born on 12 Jul 1820 in Comber, Co. Down, Ireland; died on 29 Oct 1903 in Ross Twp., Renfrew, Ontario, Canada; was buried in Haley Station, Renfrew, Ontario, Canada. [Group Sheet] [Family Chart]

1. James MCMULLEN was born about 1842 in , , , Ireland; died on 10 Mar 1893.
2. William John MCMULLEN was born on 10 Oct 1848 in Huntley Twp., Carleton, Ontario, Canada; died in 1930; was buried in Westmeath Union Cemetery, Westmeath Twp., Renfrew Co., Ontario.
3. Agnes Nancy MCMULLEN was born on 10 Sep 1851 in Fitzroy Twp, Carleton, Ontario, Canada; died on 10 Sep 1924 in Cobden, Renfrew, Ontario, Canada; was buried in Haley Station, Renfrew, Ontario, Canada.
4. Jane (Jennie) MCMULLEN was born on 9 Sep 1853 in Fitzroy Twp, Carleton, Ontario, Canada; died on 5 Jan 1889 in Haley Station, Renfrew, Ontario, Canada; was buried in Haley Station, Renfrew, Ontario, Canada.
5. Samuel MCMULLEN was born on 28 May 1857 in Fitzroy Twp, Carleton, Ontario, Canada; died on 21 Sep 1934 in Haley Station, Renfrew, Ontario, Canada; was buried in Haley Station, Renfrew, Ontario, Canada.
6. John MCMULLEN was born on 14 Sep 1860 in Haley Station, Renfrew, Ontario, Canada; died on 7 Nov 1934 in Haley Station, Renfrew, Ontario, Canada; was buried on 9 Nov 1934 in Haley Station, Renfrew, Ontario, Canada.
7. Jacob MCMULLEN was born about 1863 in , , Ontario, Canada; and died.