Cheers, that helps somewhat.
I have found a reference that talks about a trip to Wexford in 1875 by my ggUncle Owen Murphy, at the time Mayor of Quebec City. Owens father was Nicholas Murphy and mother Ellen O'brien. Refers to younger Fr. Michael, Myles and Lawrence as being Nicholas' brothers and Michael 1798 as Uncle.
Same reference quotes Wexford Independant which talks about the trip and mentions these ties.
My gggGrandfather Nicholas born about 1785 and emigrated with wife and several children about 1820.