Grealy and Fahy families of Peterswell

Michael Grealy married Eliza Fahy probably in Peterswell before 1845. They had one daughter born there in 1845 before leaving for America. They settled in Chicago and finally in Ottumwa, Iowa. Eliza had a brother named Timothy Fahy who married Mary McTigue and settled in Garden Blake, Parish of Kilthomas (Peterswell), Co Galway, Ireland- landlord  James Galbraith. Some of Timothy and Mary's children went to Australia and some settled down in Kilthomas. Any help would be great.