Son = Michael Morgan
Siblings = Emily and AJ Quartermaine
Parents = Alan and Monica Quartermaine
Best Buddy = Sonny Corinthos
Best Buddy = Carly Roberts
Although Michael is not Jason biological son, the two share a father-son relationship. Michael trusts Jason to take care of and protect him. His first word was 'Dada.'
Emily is really the only Quartermaine that Jason trusts. She loves Jason for the person his is and not the person he was before the accident.
AJ was the one responsible for the accident that changed his brother. AJ was drinking one night, and got into a car. Jason also got into the car to try and stop his brother from making the mistake of drinking and driving. AJ slammed into a tree, but was unharmed. Jason was injured. Do to the accident he has irreversible brain damage. AJ is the biological father of Michael, and Jason tries to avoid AJ whenever possible.
These are Jason's parents, but he now has as little to do with them as possible.
Sonny and Jason became friends after Jason started working for Sonny. The two are coffee merchants, friends, and neighbors.
Jason helped Carly out of a tough spot, claiming that he was the father of her unborn child. Jason took care of Carly's son when she left town, after his birth. Carly's main goal in life is to be with her family - Jason and Michael.