Charles Pratt
Register was born in 1939 in New York City to Dorothy Deming Pratt Register (1909-1998) and Samuel Croft Register. His parents divorced when he was three, and his father died when he was eleven. His maternal great-grandfather, Charles Pratt was one of John D. Rockefeller's partners in the formation of the Standard Oil Company (now Exxon), as well as founder of Charles Pratt and Company in New York and Pratt Institute in Brooklyn.