Patrick Casey was a son of Daniel Casey
Helena Donovan was a daughter of Andrew Donovan and Mary Collins of Drimimidy, Drimoleague

Patrick Casey, a Clerk, of 9 Dominick St., Cork and Helena Donovan, a Dometic Servant, of St. Joseph's Villas, Cork married on 17 November 1907 in the Catholic Church of St. Joseph, Cork.  The marriage witnesses were John Casey and Mary Collins.
 

Children born on dates shown on Civil Birth Register:

Daniel Casey born at 105 Horgan's Buildings on 7 Oct 1908

Andrew Casey born at 105 Horgan's Bulidings on 15 Nov 1910.. Andrew died on 27 Sep 1922 at Horgan's Buildings

Census 1911:
http://www.census.nationalarchives.ie/pages/1911/Cork/Bishopstown/Gurteenaspig/402873/

Deaths:
Patrick Casey died on 1 March 1931 at 105 Horgan's Buildings, Cork City.  From his death record he was married, aged 45 years, a Clerk.  Present at his death and the Informant to the Registrar was Daniel Casey of 105 Horgan's Buildings, Cork.
Helena Casey died at 105 Horgan's Buildings, Cork city on 8 October 1965.  From her death record she was a widow, aged 83 years, a housewife.  Present at her death and the Informant to the Registrar was her son, Daniel Casey of 1 Mt. St. Joseph's View, Magazine Road, Cork city.

Death announcement on the Cork Examiner newspaper:
CASEY (Cork) - On October 8, 1965 at her residence,105 Horgan's Buildings, Helena, beloved wife of the late Patrick Casey.  Very deeply regretted.  R.I.P.  Mass on to-morrow (Sunday) morning at 10 o'clock at Church of the Immaculate Conception (The Lough).  Funeral immediately after to St. Finbarr's Cemetery.