Family from Mungret and surrounding area

Researching Shea and Farrell family from Mungret immigrated to Vermont around 1848. Michael Shea and Mary Agnes Farrell (her parents Michael Farrell and Catherine Supple) Lived in Mungret just before immigration. She may be from Ballybricken and Bohermore where records of her siblings are found. . No idea of his parents names. My great grandmother was their daughter Mary Bridget b. ca 1843 who immigrated with her parents and her brother Michael, born in Mungret in 1846 probably via Canada to Vermont.  Bridget Farrell Flanagan sister of Mary Agnes also immigrated with her husband Michael and children from Mungret to Vermont.