Mary Donovan

Mary Donovan was born I think circa 1846 her father was John Donovan listed as a gardener on her marriage certificate on 26th April 1874 Fermoy Workhouse chapel. She gave birth to her first child Bridget in 1875 21st February listed on birth as Grange Rd Fermoy place of birth with Kate Donovan present at birth, her husband John Sweeney soldier listed address Haulbowline.

I am trying to find her parents John Donovan and possibly Mary Downing, I have found a list with John Donovan Gardener listed in possibly Midleton as Chapel Road dated 1846 but cannot find any other records of who Mary's parents where or there address brothers or sisters. I presume Kate Donovan present at Bridget's birth was Mary's sister?.

Any help tracking the Donovan family down would be great.