John Flahavan was a son of Jeremiah Flahavan
Mary Mahony was a daughter of John Mahony

John Flahavan of Ballinaclough and Mary Mahony of Ballinaclough married on 4 March 1880 in the Catholic Parish of Kilmacabea.  The marriage witnesses were James Hayes and Ellen Mahony.

Children born in Ballinaclough on dates on Civil Birth Register

John Flahavin, 1 Apr 1881

James Flahavin, 6 Aug 1883

Jeremiah Flahavin, 4 June 1886

Stephen Flahavin, 14 Feb 1890

Mary Flahavin, 3 Oct 1891

Ellen Flahavin, 16 apr 1893

Michael Flahavin, 1 Feb 1895

Patrick Flahavin, 7 Mar 1897.  Patrick married Mary Donovan, daughter of Patrick Donovan and Ellen Hegarty.

Census 1901:
http://www.census.nationalarchives.ie/pages/1901/Cork/Rosscarbery/Ballinaclough/1162318/

Census 1911:
http://www.census.nationalarchives.ie/pages/1911/Cork/Derry/Ballinaclogh/380593/

Death:
Mary Flahavan died at Ballinaclough on 24 July 1938.  From her death record she was aged 86 years, a farmer's widow.  Present at her death and the Informant to the Civil Register was Michael Flavin, her son of Ballinaclough.
Mary is recorded in burials in Rosscarbery Abbey.