Brett's younger brother, Nick Ritchie, plays in the NHL for the Toronto Maple Leafs. Nick was drafted 10th overall by the Anaheim Ducks at the NHL Entry Draft. During the 2012–13 season, Ritchie played with Team Canada to win gold medals at both the 2012 Ivan Hlinka Memorial Tournament and the 2013 IIHF World U18 Championships. Brett is currently dating Jamie Andries.