O'Callaghan/Lutteral/Hassett/Collison

Looking for information on any of the above families. My father James Kiernan O'Callaghan 1911-1976 was born in Nenagh of Michael Aloysius O'Callaghan 1876-1946 and Bridget Delia Lutteral 1875-1931. Bridget's parents were James Lutteral 1851-1900 and Anne Madie Hassett of Park (Rostrehid) Toomevara 1851-1921. Also, my aunt Margaret Lutteral 1877-1946 married Gerald Timothy Mackey 1881-1946 of Nenagh. Margaret and Timothy moved to New York City, where my father and his brother Bernard 1906-1975 joined them in 1928-1929. Many Hassetts in Toomevara and some connected to Collisons. Brien O'Callaghan Bethel CT US cell: 203.788.6993, brienoc@att.net, and at this website.