[8] His maternal grandparents were Josiah Gilbert Pierson and Julia Boudinot (née Colt) Pierson and his paternal grandparents were Judge Robert Emmet and Rosina (née Hubley) Emmet.

The Colonial revival home was designed in 1906 by architect Charles A. Platt, finished in stucco with wooden detailing at the principal doorways, roof cornice and porch.

[16] Together, they were the parents of nine children, including:[9] Emmet died on July 22, 1957, at his home in Stony Brook overlooking the Long Island Sound.

[11] His widow died on August 31, 1969, and after a mass at St. Philip and James Roman Catholic Church, she was buried at St. Patrick's Cemetery in Hauppauge, New York.

[27] Through his daughter Elizabeth, he was a grandfather of Edwin D. Morgan III (1921–2001),[28] who married Nancy Marie Whitney, the daughter of Cornelius Vanderbilt Whitney and Marie Norton Harriman (the second wife of New York governor W. Averell Harriman).