I don't know if it is the same family. Could be. I have been unable to find any information on Margaret Ann Elizabeth Cassidy's ancestors.
She ultimately married Ritchie Gallagher. She was born Oct. 31, 1852 in Limavady; the family moved to Vancouver, Canada about 1909 or 1910. She died Dec. 21, 1928 in Vancouver.
They had six children: Joseph, born 1881; Francis, born 1883; Margaret, born 1884; Ritchie, born 1888; Martha, born 1892; Robert, born 1892; Frederick, born 1895; and Elizabeth.