Cornelius Mahony was a son of Patrick Mahony and Margaret Sullivan.
Honora (Nora / Norrie) Donovan was a daughter of Daniel Donovan and Johanna Hayes.

Cornelius Mahony of Kilbeg and Hanorah Donovan of Killcosane married In Kilmacabea Catholic Church.  The marriage witnesses were Dan Sullivan and Mary A McCarthy.
 

Children born at Kilbeg on dates from Civil Birth Register:

Margaret Mahony, 25 Mar 1905

Hannah Mahony, 17 July 1906

Patrick Mahony, 29 June 1907

Ellen Mahony, 27 May 1909

Nora Mahony, 9 Feb 1911

John Mahony, 27 June 1912

Mary Mahony, 2 July 1914

Cornelius Mahony, 16 Aug 1916

Catherine Mahony, 29 Jan 1919

Census 1911:
http://census.nationalarchives.ie/pages/1911/Cork/Kilfaughnabeg/Kilbeg/443193/

Deaths:
Cornelius Mahony died on 7 September 1939 at Kilbeg, Leap.  From his death record he was married, aged 74 years, a farmer.  Present at his death and the Informant of it to the Civil Registrar was Nora Mahony, his widow.
Nora O'Mahony died on 28 March 1953 at Kilbeg.  From her death record she was a widow, aged 74 years, a farmer's widow.  Present at her death and the Informant to the Civil Registrar was Hanna Calnan, daughter.