Downs family from Liscannor

What I know (or have some evidence of):

1. My gg-grandparents, James (1816 -1876) and Mary Ann Murtagh (1822-1895) were married in 1843 in Liscannor.         James may have been born in Liscannor as well. 

2. My great-uncle, Thomas Downs, was born and baptised in Liscannor about November 21,1844

Their next child, Mary, was also born and baptised in Liscannor in February 1847. She died in 1849 in Port Huron, Michigan. The assumption is that they emigrated from Ireland at some point in between those dates.

The family settled in Emmet,MI and the other children (Frances, David, John, and Michael) were born there. 

Michael (1861-1937) is my great-grandfather and he settled in Hurley, WI after his marriage to my great-grandmother, Mary Burns.

My father, who is the son of their daughter, Marguerite Donna Downs (1892-1939), used to say that his Irish ancestors were "Northern wetbacks" who came into Michigan from Canada.

I briefly visited Liscannor in 2022 and hoped to find out more about my family or even any relatives that may have remained there. Unfortunately, I was unable to find out anything while there.

If anyone has any information about this family that can be shared or any ideas of records that may be helpful, I would appreciate it!