William married Mary Howard on 23 Apr 1856 in Bushmills Presbyterian Church, Bushmills, Co. Antrim, NI. Mary (daughter of Thomas Howard) was born about 1819; died on 4 Feb 1897 in Ballyhemlin, Billy Parish, Co. Antrim, NI. [Group Sheet] [Family Chart]

1. Martha Heaney
2. Robert John Heaney was born about 1858; died on 9 Jan 1901 in Ballyhemlin, Billy Parish, Co. Antrim, NI.
3. Thomas Heaney was born about 1865; died on 16 Feb 1927 in Magherintendry, Billy Parish, Co. Antrim, NI; was buried in Billy Parish Churchyard, Bushmills, Co. Antrim, NI.