Thomas was born in 1959. Thomas' father was Stephen Harding and his mother was Cathy Brophy. His paternal grandparents were John Harding and Rose Ann Leahy; his maternal grandfather was Btophy and his maternal grandmother is <Unknown>. He had two brothers and two sisters, named Francis, Stephen, Ann and Martina. He was the second oldest of the five children. He died due to Cystic Fibrosis at the age of 1 in 1960.