I am also related to the Grealis family. My great-grandmother was a Margaret Grealis who married John O'Malley in Cleveland, Ohio. She was originally from the township of Ballycroy in County Mayo, Ireland. According to the Cleveland Necrology File Margaret & Pater were siblings. My Father and I went to Ireland in 2010 but didn't have time to get copies of Margaret's birth record but did she the parish church and even met a Grealis (no sure if we are related).