Mariah Carey's brother, Morgan Carey, is not backing down in his legal fight against the pop icon.

The 60-year-old sought to amend his lawsuit, aiming to include additional claims of "defamatory" statements in his case against his famous sister.

Last year, a judge ruled that Mariah Carey and her brother must sit for court-ordered depositions, forcing them to face each other despite their longstanding estrangement.

The judge's deposition ruling stemmed from Morgan Carey's 2021 lawsuit, where he accused his sister Mariah Carey of defamation over claims she made in her memoir, "The Meaning of Mariah Carey."

Morgan has asked the court for permission to amend his lawsuit against the pop icon, claiming he has uncovered fresh "false, disparaging, and defamatory" remarks she has made about him, some of which he found on YouTube.

Morgan argues that neither Mariah nor her team ever contacted him for a response before publishing her 2020 memoir.

In the book, she painted him as violent and involved in drug dealing, claims he vehemently denies. He insists he was never given a chance to dispute the allegations before they were made public.

Morgan also takes issue with a shocking passage in the memoir, where Mariah alleges that in 1980, he accepted money from a woman to kill her husband but backed out. The woman later committed the murder herself, and Morgan testified at her trial, per In Touch.

Morgan's lawsuit did not just focus on Mariah's memoir, he is also targeting a YouTube documentary he discovered in 2025, which he noted racked up 220,000 views. The documentary includes a clip of the singer making explosive accusations, stating:

"They had the audacity to throw me into institutions, give me drugs, and try to take control of my life. It was no coincidence that my mother and brother were working on the side of the record company instead of protecting me and advocating for my well-being and that they just happened to claim that I was unstable and try to institutionalize me immediately after I had signed the biggest cash record deal for a solo artist in history."

Morgan alleges that the "they" in Mariah's statement refers to him and their mother, Patricia. He also claims that the YouTube account behind the documentary is somehow connected to Mariah.

Calling the accusations "false and defamatory," Morgan insists in his amended suit that neither he nor his mother ever attempted to have Mariah institutionalized or gain control of her finances, labeling her claims "a vicious lie."

A judge ruled that Mariah could no longer avoid facing her estranged brother in his defamation lawsuit. Court documents revealed that both siblings were ordered to sit for depositions before January 31, 2025.

While Mariah was required to participate, the ruling also stated she "reserves the right to seek limitations on the scope of discovery."

The legal battle took a personal turn, as The Blast reported that the judge's decision came just weeks after the siblings suffered a devastating family loss. Their mother, Patricia Carey, and their sister, Alison Carey, both passed away on the same day in August.

Mariah had previously confirmed the news in a heartfelt statement, stating, "My heart is broken that I've lost my mother this past weekend. Sadly, in a tragic turn of events, my sister lost her life on the same day."

Before her mother, Patricia passed away, the 56-year-old revealed that she spent the last week of her life by her side. The touching gesture showed how their once-strained relationship had evolved over time.

The mother and daughter shared a complex history, which Mariah openly addressed in her memoir, "The Meaning of Mariah Carey." Their bond was shaped by Patricia's divorce from Mariah's father, Alfred Roy Carey, when the singer was just 3 years old.

In her book, Mariah described their relationship as anything but simple, writing, "Like many aspects of my life, my journey with my mother has been full of contradictions and competing realities. It's never been only black-and-white -- it's been a whole rainbow of emotions."

Despite their ups and downs, Mariah ultimately found a sense of peace in their connection. She acknowledged her mother's efforts with a heartfelt dedication in the memoir, writing, "And to Pat, my mother, who, through it all, I do believe actually did the best she could. I will love you the best I can, always."

Before her passing, Alison Carey took legal action against her famous sister over claims made in the star's memoir. Alison, who had long been estranged from Mariah, filed a lawsuit demanding $1.25 million in damages, accusing the entrepreneur of publicly humiliating her.

In the lawsuit, Alison described Mariah's words as "heartless, vicious, vindictive, despicable, and totally unnecessary," claiming they inflicted severe emotional distress.

She alleged that Mariah used her celebrity platform to attack her, painting a damaging picture of her past just to generate publicity and boost book sales.

Alison further expressed that the allegations left her deeply devastated, arguing that Mariah's portrayal only added to the struggles she had already endured.

With this latest legal move, Morgan has made it clear that his battle against Mariah Carey is far from over.