Michael married Mary Hayes on 18 Feb 1890 in Cappamore Catholic Church, Cappamore, Co. Limerick, IE. Mary (daughter of Thomas Hayes and Bridget Bray) was christened on 27 Jan 1865 in Ballina, Co. Tipperary, IE; died on 18 Apr 1908 in Saint Joseph's Hospital, Mulgrave Street, Limerick, Co. Limerick, IE. [Group Sheet] [Family Chart]

1. William Joseph Heffernan was born on 19 Apr 1892 in Doon, Co. Limerick, IE; died in Jun 1967 in New York, NY, US.
2. Catherine Heffernan was born on 14 Dec 1893 in Doon, Co. Limerick, IE.
3. Bridget Heffernan was born on 9 Aug 1895 in Doon, Co. Limerick, IE; died after 1916.
4. Thomas Heffernan was born on 28 Aug 1898 in Doon, Co. Limerick, IE; died on 14 Jul 1916 in Lisgaugh, Doon Parish, Co. Limerick, IE.