I believe you are refering to my First Cousin Kate Mahar. My Uncle Leo Mahars Daughter. Uncle Leo was married twice. once to a Lady who`s last name was Blacquire. She died giving birth to Leo`s Daughter Margaret. He then Married Katie Collins from Ireland. I knew her and she was not Michael Collins Sister. That was a "myth" started by one of her brothers.according to My cousin Catherine: Leo and Katies Daughter who married a Costello. Who as I remember was a taxi driver here in charlottetown. Michael Collins Sister married a Sheridan man in Ireland and remained there till she died.
Michael's Sister: Kate Collins married a Joseph Sheridan.In Ireland. She remained in Ireland. Michael Collin`s father was Michael John Collins and his mother was Maryanne O'Brien.
Michael Collins Family Tree. Siblings were: Margaret. John. Johanna. Mary Ann. Helina. Patrick. Kathleen. Helina became a Nun Hannie did not marry Patrick went to Chicago and was a police officer. Margaret, John, Mary and Kate remained and married in Ireland.