Jason Blossom

Other Relatives:
 * Hal Cooper  (2nd cousin, 1× removed)
 * Alice Cooper  (2nd cousin-in-law, 1× removed)
 * Polly Cooper  (3rd cousin/fiancée)
 * Betty Cooper  (3rd cousin)
 * Roxanne Lynch/Hook (3rd cousin)

Jason Blossom

Jason was the son of Clifford and Penelope Blossom, and the twin brother of Cheryl Blossom. He was captain of the school water polo team and a member of the Riverdale Bulldogs. He supposedly died under mysterious circumstances when he fell from a boat into Sweetwater River on July 4th, prior to the start of the series. But as it turns out, he died a week later around July 11th when he was shot by an unknown assailant, who was later revealed to be his own father, Clifford Blossom. He is also the late father of Polly's twins, Juniper and Dagwood.

After his body was found, Jason was buried in the cemetery on the grounds of Thornhill. Prior to the discovery of his body, his parents buried an empty casket. During the third season, the Farm dug up Jason's body in efforts to gain Cheryl's loyalty. Unable to part with him again, she kept his corpse hidden inside Thistlehouse. However Cheryl was finally able to let go of Jason and gave him an Viking funeral on Sweetwater River.

Early Life
Jason grew up in Riverdale, alongside his twin sister, Cheryl Blossom. Prior to the start of the season, he was in a relationship with Betty Cooper's sister, Polly. According to Betty, he meant the world to her but she meant nothing to him. The relationship ended badly, Cheryl speculated that Jason was likely the reason that Polly suffered a nervous breakdown and was sent to live in a group home.

When Jason and Cheryl were younger, their mother would take them upstairs into their rooms, where she would tell them bedtime stories about the Sugarman, her very own concocted version of a child's Bogeyman, in an attempt to turn an all-too-real monster into something less. Little did Jason know at the time, the Sugarman was real, and looking to protect them from the danger that followed was their mother, who sent Jason and Cheryl into their rooms whenever he would visit Thornhill.

Trivia

 * Jason was in an independent study program with Geraldine Grundy while at Riverdale High School. She considered him to be inspirational.[16]
 * According to Cheryl, Jason always adored the drive-in.
 * Jason is older than Cheryl by three minutes.