Lawrence "Larry" Casey was born in 1940, one of eight siblings (William Jr., Paul, John, Joseph, Mary, Peter, and the late Michael), born to to William and Florence Casey. When Larry was 10 years old, his family moved to Manhattan's East Side where the very tall and athletic Larry played baseball and one day wanted to become a professional ball player. Casey's father died in February 1955 and Larry gave up baseball to work after school to help support the family. He graduated high school in 1958. In 1962 his mother bought a dairy farm in Guilford, where she would live with her sons Paul and John until her own death in December 2004, almost 50 years after she was first widowed. Larry Casey and his wife Katha have three children.