I am researching my g/grandfather James Mullenn who immigrated to the US in 1879. I have been told that his parents names were Peter and Catherine (McGuire) Mullens. He had 2 brothers named Peter and Joseph and a sister named Kate- all stayed in Ireland. His brother Peter apparenlty owned a mercantile somewhere in Ireland. I was told that County Downs had information. The father captained a ship, more than likely not his own, but not sure. The boys worked on the ship when old enough. They shipped goods- so a merchant ship I guess. I would like to verify this information or maybe find living relatives. I heard that my g/grandfather was estranged from his brother Peter due to a family dispute. My 80 year old aunt told this to me and I'm not so sure she's correct on some things. Thank you for any help.