looking for relations of Mary Conley Gibbons

mary Conley Gibbons lived in Ireland in the 1800s. She married Thomas Gibbons. Theur son John Henry Gibbons was born in conty Mayo Ireland 9 June 1853 died 12 April 1911 (in Joliet IL). He emigrated sometime prior to 1881.
I have been unable to trace Thomas Gibbons and Mary Conley/Connolly/Connelley. Since Gibbons is a very common name in South Mayo I was hoping to find information on the Conleys.