Hello Gwyneth,
I'm not certain of William's relationship. A search through church records may reveal something. It looks as though he didn't live in Ballinamallard.
Bleakley - Griffith's Valuation - Fermanagh - 1862
William, Castle Irvine Demesne, Derryvullan
William, Sessiaghs, Magheracross
William, Crocknaboghil, Clones
William, Bosallagh, Clones
Rebecca, Littlemount, Aghavea
Rebecca, Rathkeelan, Aghavea
Rebecca, Coolcrannell, Aghalurcher
Christopher