I am off out now but it is James who married Ann that was born abt 1839, wasn’t it?
It is that birth I am querying as there is the conflicting ‘evidence’ (in the tree and in NY) that James, son of James and Ellen, emigrated as a child.
If this were true, then your James would not be the one born 1839 in Dundalk.
I just don’t want you to be following the wrong person.
Bernard’s family are born in various places and Rose, his mother, is with the children but not her husband in censuses.
I wondered if they were not Dundalk originally.