Collins and Davy Families, Achonry, Sligo

My name is Steve Collins from Melbourne Australia, and I am interested in making contact with anybody with Collins or Davy ancestors from Sligo - particularly from Achonry.  The townlands I am interested in are Carrowntober and Drumbaun, around 1800 to 1900.

My Great, Great Grandfather, John Collins (b. 1833) came out to Sydney, Australia via Liverpool, aboard the "Golden Era" in 1855.  His elder sister Mary (b. 1827) made the same trip aboard the "Malvina Vidal" in 1853, and their siblings William (b. 1835) and Bridget (b. 1841) came out to Sydney in 1860 aboard the "Fitzjames".  They also had a sister Catherine (b. 1835) who remained in Achonry.  William, Catherine and Bridget were residing in Carrowntober, Achonry, Sligo before applying to emigrate.  All 5 were illiterate Catholic farm labourers or domestic servants.

Their parents were Michael Collins (born possibly 1800 +/- 10 yrs?) who was still alive in Achonry in 1860, and his wife Catherine (nee Davy, or possibly Davey, Davie or Deavey - spelling uncertain due to illiteracy of children), who died at some point between 1841 and 1853.  Not certain of the existence of any other siblings (if any).

I have a lot of information about the ones who came to Australia, but seek information about their ancestors and siblings (if any) and the descendants of those siblings.