The Backstreet Boys’ Nick Carter announced late Tuesday that he had obtained a restraining order against his brother, singer Aaron Carter, over alleged threats to his pregnant wife. “In light of Aaron’s increasingly alarming behavior and his recent confession that he harbors 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,” a statement Nick Carter posted Tuesday night reads. He went on to say he hoped his brother would get the “proper treatment he needs before any harm comes to himself or anyone else.”

This comes after Aaron Carter revealed last week that he had been diagnosed with multiple personality disorder, schizophrenia, acute anxiety and manic depression. He also announced that he would be canceling some of his tour dates this year due to a “private family matter.”

Aaron Carter responded to the restraining order by attacking his brother. “Take care. [Nick] we’re done for life,” he wrote. He then retweeted a number of messages about sexual-assault allegations against Nick Carter, writing about claims made by the singer Melissa Schuman: “She was 15 and I was there! Its statutory rape.”