Solange Knowles fears that her sister Beyonce is making a big mistake by defending her husband, Jay-Z, through a child rape lawsuit.

Beyonce has stood with her husband as he battles allegations of sexual assault from a woman who say he raped her with P. Diddy at an MTV afterparty when she was 13.

Now, sources tell Daily Mail that Solange is worried Beyonce's career will be damaged irreparably if she does not change her stance.

Beyonce's sister intervenes

This isn't the first time Solange has opposed her brother-in-law, whom she infamously attacked in an elevator in 2014. Jay-Z would later admit to being unfaithful to Beyonce, but the couple reconciled and stayed together.

Now, their marriage is weathering another tempest as Jay-Z, whose real name is Shawn Carter, denies raping a young girl around the same age as his 12-year-old daughter.

Beyonce trusts that her husband is innocent, sources told the Mail, but the case has put enormous strain on their family. The singer is facing pressure from her sister, who is telling Beyonce, "I told you so" after Jay-Z was caught cheating years ago.

"Solange told Beyoncé, she warned her a decade ago and she wouldn’t listen," a source told the Daily Mail.

Carter rebuked by judge

Carter's accuser has acknowledged inconsistencies in her story, but she stands by her claim that Carter and Sean Combs, also known as P. Diddy, raped her at an MTV afterparty in 2000 when she was a minor.

The woman accused Carter in December, adding him to an amended lawsuit against Combs. The judge has allowed the woman to remain anonymous, rejecting Carter's efforts to make her identify herself to the public.

“Carter’s lawyer’s relentless filing of combative motions containing inflammatory language and ad hominem attacks is inappropriate, a waste of judicial resources, and a tactic unlikely to benefit his client,” Judge Analisa Torres wrote in the court order.

Jay-Z has said he is the victim of an extortion attempt by lawyer Anthony Buzbee, who is representing dozens of Diddy's alleged victims.

"My wife and I will have to sit our children down, one of whom is at the age where her friends will surely see the press and ask questions about the nature of these claims, and explain the cruelty and greed of people," Carter said in response to the accusation.