My GGF's sister Mary Connolly married a Michael Brennan in Pawtucket. Michael was born in Ireland about 1845 and emigrated in about 1864. They had 4 children: James E 1870-1941, Ellen F died as infant in 1873, Margaret 1875-? and John J 1877-?. Michael Brennan remarried Catherine/Kate Donnelly and had a son Joseph J. 1884-? I have not traced these people forward. I have other Brennans in my line, but they were in nearby North Attleboro, MA.

If you can trace back another generation and get parents names from death or marriage certificates, there may be a match here.

Good luck!