In what appears to be a bizarre family feud playing out in public - on Twitter, no less - Nick Carter of Backstreet Boys has filed a restraining order against his own brother, Aaron Carter.

In a series of tweets, Aaron Carter spoke about how he was served notice on the order, and that he claimed he hadn't seen his brother in four years. Yet, a post from Facebook in 2017 shows him at his brother's house, playing with his nephew as a baby.

Nick Carter, meanwhile, confirmed the restraining order and posted a statement in which he described Aaron Carter's erratic behaviour.

"In light of Aaron's increasingly alarming behaviour and his recent confession that he harbours thoughts and intentions of killing my pregnant wife and unborn child, we were left with no choice but to take every measure possible to protect ourselves and our family," the statement read.

Aaron, however, then fired back with a series of allegations involving his brother, Nick, and a rape charge against him that was ultimately dismissed in 2018 as the statute of limitations had passed.

Nick has yet to respond to any of Aaron's further tweets.