- Kyle Hadfield was born on August 12, 1990. He attended Trinity College School and graduated from the University of Toronto with a degree in aerospace engineering. He is a pilot and a lieutenant in the Royal Canadian Air Force.
- Evan Hadfield was born on December 21, 1992. He attended Trinity College School and graduated from the University of Toronto with a degree in computer science. He is a software developer and works for a tech company in Toronto.
- Julie Hadfield was born on October 10, 1994. She attended Trinity College School and graduated from the University of Toronto with a degree in environmental science. She is a sustainability consultant and works for a consulting firm in Toronto.