 The Brittens are a family who live in Los Angeles , California , in the United States , at an unknown address . Michael , the father , works at the Los Angeles Police Department as a police detective , alongside his partner Isaiah Freeman , who he calls Bird . After a car crash , Michael , the father , has to live in two separate realities , one in which his wife Hannah was killed in the crash , and in the other his son Rex was the one killed . Also , in one reality , his now works with a new rookie partner Efrem Vega , where Isaiah goes to work in the Western Division with Ed Hawkins . In the other reality , he is still partnered with Bird . He see two two separate therapists : Dr. John Lee in one reality , and Dr. Judith Evans in the other . Michael is married to Hannah , an American housewife and mother . They have one son child : Rex , a school teenager who is very emotional , rude , and gets low grades after Hannah 's death in that reality . His best friend is Cole , whom he works on a motorbike with . The family owns a Chevrolet as a vehicle . 
