Denis Mahony was a son of William Mahony and Catherine Spillane.
Mary Mahony was a daughter of William Mahony and Mary Daly.

Denis Mahony (24) of Ceancullig and Mary Mahony (24) of Lackareagh married on 22 February 1887 in the Catholic Church in Drimoleague.  The Witnesses were Denis Mahony and Ellen Spillane.

Children born in Leitry on dates on Civil Birth Register:

Kate Mahony, 20 Mar 1888

William Mahony, 10 Feb 1890

Ellen Mahony,  circa 1891

Denis Mahony, 30 Aug 1892

Patrick Mahony, 13 Aug 1895

Daniel Mahony, 17 Oct 1896

John Mahony, 5 Nov 1898

Mary Anne Mahony, 5 July 1902

Jeremiah Mahony, 20 July 1906

Census 1901:
http://www.census.nationalarchives.ie/pages/1901/Cork/Dromdaleague_North/Leitry_Lower/1153964/

Census 1911:
http://www.census.nationalarchives.ie/pages/1911/Cork/Dromdaleague_North/Leitry_Upper/440165/

Deaths:
Denis William Mahoney died at Leitra on 29 December 1928.  From his death record he was married, aged 72 years, a farmer.  Present at his death and the Informant of it to the Civil Registrar was Mary Anne Mahony, his daughter of Leitra.
Mary Mahony died at Leitra on 12 November 1934.  From her death record she was a widow, aged 71 years, a housekeeper.  Present at her death and the Informant to the Civil Registrar was Patrick Mahony, son, of Leitra.