Denis Collins was a son of Daniel Collins and Kate Donovan.
Hannah Crowley was a daughter of Patrick Crowley and Hannah Grace.

Denis Collins and Hannah Crowley married on 9 February 1895 in the Catholic Church in Drinagh.  The Witnesses were Patrick Crowley and Marie Crowley.

Children born in Drinagh East on dates on Civil Birth Register:

Kathleen Collins, 6 Nov 1895

Mary Margaret Collins, 17 July 1897

Annie Josephine Collins, 7 Dec 1899

Julia Crowley, 27 Aug 1901.  Julia died on 27 Mar 1907

Daniel Collins, 15 Sep 1907

Census 1901:
http://www.census.nationalarchives.ie/pages/1901/Cork/Drinagh/Drinagh_East/1141793/

Census 1911:
http://www.census.nationalarchives.ie/pages/1911/Cork/Drinagh/Drinagh_East/410012/

Deaths:
Hannah Collins died on 20 October 1931 at Drinagh East.  From her death record she was married, aged 69 years, a farmer's wife.  Present at her death and the Informant of it to the Civil Registrar was Denis Collins, husband of deceased, of Drinagh East.:
Denis Collins died on 28 January 1948 at Drinagh East.  From his death record he was a widower, aged 82 years, a farmer.  Present at his death and the Informant to the Civil Registrar was  Daniel Collins, son, of  Drinagh East.