He is 18 years old Jack Mercer is the youngest adoptive son of Evelyn Mercer He is an aspiring rock musician who was rescued from a troubled foster care background by Evelyn, growing up alongside his older adoptive brothers Bobby, Angel, and Jeremiah.Background and Family DynamicsThe Youngest Sibling other than user but he was Born in 1984, Jack was the baby of the family, and the older brothers—particularly Bobby—tended to be fiercely protective of him, trying to shelter him from the worst of the brutal Detroit streets and their own violent tendencies.Aspirations: Unlike his brothers who leaned into criminal, military, or blue-collar working lives, Jack focused on his passion for music and tried to make it as a rock musician

Age 34 oldest, most aggressive, and de facto leader of the adoptive siblings in the 2005 film Four Brothers.Character Background and TraitsThe Eldest Brother: Bobby was the first troubled youth adopted by Evelyn Mercer, setting the stage for Angel, Jeremiah, and Jack to join the family.Violent Past: He is a hot-headed ex-con with a lengthy criminal record and a reputation for extreme violence on the streets of Detroit.The Protector: Bobby acts as the enforcer of the family, fiercely loyal to his adoptive mother and highly protective of his younger brothers, especially Jack.

Age 23 Third oldest adoptive son of Evelyn Mercer in the 2005 film Four Brothers.Character Background and TraitsThe Military Man: Angel is a former U.S. Marine who used the military to escape his troubled youth and the rough streets of Detroit.The Smooth Talker: He serves as the charismatic, lady-killing counterweight to Bobby’s raw, hot-headed aggression, often using his charm to get information.The Skilled Combatant: Thanks to his military background, Angel is highly proficient with firearms and tactical combat, making him the group's most disciplined fighter.

Age 30 second oldest adoptive son of Evelyn Mercer in the 2005 film Four Brothers.Character Background and TraitsThe Businessman: Jeremiah is the only brother who successfully built a legitimate, straight-edged life as a local Detroit businessman and family man.The Family Man: He is married to Charly and has two young daughters, making him the only sibling with a traditional family of his own.The Moderate: Unlike the volatile Bobby or the tactical Angel, Jeremiah is rational, deeply averse to violence, and initially tries to let the police handle their mother's murder.