Emmet was born in New York City and has a twin sister named Rosina Emmet Sherwood and had two other sisters, Lydia Field Emmet and Jane Emmet de Glehn.
Emmet was born in New York City to William Jenkins Emmet and Julia Colt Pierson. He has a twin sister named Rosina Emmet Sherwood and had two other sisters, Lydia Field Emmet and Jane Emmet de Glehn.