Nick and Aaron Carter came to blows at their home on Monday, the night before they announced their new E! reality show House of Carters at the Television Critics Association gathering in Los Angeles.
Asked what caused the dustup, Nick, 26, told PEOPLE, “Eh, we’re brothers, it happened.”
Aaron, 18, added, “Yeah, we’re brothers, but this time …” He then lifted his bangs to expose a bruise near his hairline, above his left eye.
How did the fight start? “Aaron jumped me and I jumped him back,” Nick said, revealing only that they’d been arguing “over a little misinterpretation.”
Aaron’s twin sister, Angel, told PEOPLE a House of Carters cameraman broke up the fight.
The whole scuffle was caught on tape. “You’ll see it on the show,” said Aaron.
House of Carters, which debuts in October, features all five siblings living together in L.A. and trying to work on their relationship away from their parents. Backstreet Boy Nick is meant to serve as the family role model.
The Carter parents, Jane and Robert, have had strained relationships with their children. In 2004, the same year his parents went through a messy divorce, Aaron petitioned for legal emancipation from Jane, who was his manager, over a financial dispute.
Besides Nick, Aaron and Angel (an aspiring model), the Carter brood includes sisters Bobbie Jean, 24, who is considering culinary school, and Leslie, 20, a singer who’d been living in Toronto.
Last year, Nick was ordered into an alcohol education program in Orange County, Calif., after pleading guilty to drunk driving.
An ex-boyfriend of Paris Hilton, Nick was also ordered to pay $1,200 in fines and be placed on informal probation for three years, with restricted driving privileges for 90 days, Deputy District Attorney Tate McCallister told the Associated Press.