Here are a few others with the Cain and Abel profile. Cannanites, sacrificial Ba'al worship.
Cain, the firstborn, was a farmer, and his brother Abel was a shepherd. The brothers made sacrifices to God, but God favored Abel's sacrifice instead of Cain's. Cain then murdered Abel, whereupon God punished Cain by condemning him to a life of wandering.. .
Kelsey Grammer - In 1975, when Kelsey Grammer was 20 years old, his 18-year-old sister, Karen, was sexually assaulted and slain. Freddie Glenn was convicted for his role in the high-profile crime, the details of which were extremely violent and graphic.
Chelsea Handler - When Chelsea Handler was just 10 years old, her older brother went on a hiking trip and fell off an 80-foot cliff in the Grand Tetons.
Stephen Colbert - When Stephen Colbert was just 10, he lost two of his brothers and his father. In 1974, Eastern Airlines Flight 212 went down in a cornfield in North Carolina. Colbert's father and brothers, Peter and Paul, ages 18 and 15 respectively, didn't survive the incident.
Jennifer Hudson - In 2008, Jennifer Hudson suffered a high-profile tragedy involving more than one family member. William Balfour, the estranged husband of Hudson's sister, terminated Hudson's mother and brother in their home. Authorities later found Hudson's 7-year-old nephew slain in a stolen SUV.
Joseph Gordon-Levitt - In 2010, when Joseph Gordon-Levitt was 29, his 36-year-old brother, Daniel, passed. Some media outlets speculated Daniel suffered an overdose; however, Gordon-Levitt has vehemently denied that characterization. “He died first," the actor said of his sibling, who co-founded their production company. He continued: “So, I have that as an example, in a way. And, frankly, it makes it less scary in a way, too, knowing that he’s done it. Because all the big things that I ever had to do, he did 'em first. Guess that’s what it’s like being second.”
Joaquin Phoenix - Joaquin Phoenix was 19 years old when he witnessed his brother, River, suffered a fatal and very high-profile overdose in Los Angeles in 1993. According to River Phoenix's friend Bob Forrest, the actor consumed a toxic combination of substances.
It goes on and on. I think this was just about actors and singers. This list didn't even get to Anderson Cooper, whose brother, Carter, died in 1988 at the age of 23.
https://www.ranker.com/list/famous-people-with-twins-who-passed/celebrity-lists
https://www.ranker.com/list/celebrities-who-lost-siblings-young/celebrity-lists