Jeremiah Mahony was a son of Denis Mahony and Catherine Crowley.
Ellen Duggan was a daughter of Denis Duggan and Honora Barry.

Jeremiah Mahony of Grange and Ellen Duggan of Grange married in 1883 in the Catholic Church in Ovens, Co. Cork.  The witnesses were Denis Duggan and Kate Duggan.

Children born in Grange on dates on Civil Birth Register:

Catherine Mahony, 8 Sep 1883. Kate died at Grange on 6 July 1901, aged 18 years

Hanora (Annie) Mahony, 24 Feb 1885

Timothy Mahony, 31 Aug 1887.  Timothy aged 8 months died at Grange on 18 May 1888
 

Death:
Ellen Mahony died on 4 October 1890 at Grange.  From her death record she was married, aged 37 years, a farmer's wife.  Present at her death and the Informant of it to the Civil Registrar was her brother, Denis Duggan of Grange.
 

Census 1901:
http://census.nationalarchives.ie/pages/1901/Cork/Ballygroman/Grange/1090930/

Census 1911:
http://census.nationalarchives.ie/pages/1911/Cork/Ballygroman/Grange/373983/

Death:
Jeremiah O'Mahony died at Grange on 13 April 1933.  From his death record he was a widower, aged 80 years, a cottagier.  Present at his death and the Informant to the Civil Registrar was Annie O'Mahony, his daughter.
Death announcement on The Cork Examiner of FRiday, April 14, 1933:
O'MAHONY (Ovens) - On April 13, 1933, at his residence, Grange, Ovens, Jeremiah O'Mahony.  Funeral from Ovens Catholic Church on to-morrow (Saturday) at 3 p.m. (summer time) for Knockavilla.