In need of help....great grandfather was James B. Mcdermott born 1821 in Co. Roscommon. I haven't been able to find out what town or who his parents were or names of siblings. I started doing a search on the one sister I know for sure. Her name was Catharine Mcdermott ca.1820 who married Martin J. O'Connor. They immigrated to Canada possibly, before they ended up in Scranton PA because their first 3 children were born there: John, Martin, Michael and Winifred (she was born in Scranton). Catharine's grandson named Martin J. O'Connor would go on to be an archbishop in Scranton at the St. Peter's Cathedral there. Since James her brother was somewhat of a dead end I thought (maybe) Catharine would lead me to more information.
Any help/suggestions is appreciated. Thank you, Lynn