"Born Sean Stephen Maguire on 26 December 1927, he later changed his name to McGuire. His father, John, from Co. Cavan, who had come to Belfast to work in 1918, was an accomplished musician with his own ceilidh band. John played piccolo, concert flute, whistle and fiddle. It was a musical family; Sean’s brother Jim was a fiddle player and they recorded an album together in 1982"
The full article is an interesting read about Sean and can be found Here