OpenAI CEO Sam Altman’s sister Ann Altman filed a lawsuit Monday alleging her brother regularly sexually abused her between 1997 and 2006.

The lawsuit, filed in U.S. District Court for the Eastern District of Missouri, alleges that the abuse took place at the family home in Clayton, Missouri, and began when Ann, who goes by Annie, was 3 and Sam was 12 The plaintiff alleges that the abusive activities occurred “several times a week,” starting with oral sex and later including penetration.

The lawsuit alleges that “as a direct and proximate result of the above-mentioned sexual assaults,” the plaintiff “suffered severe emotional distress, mental anguish and depression, which is expected to continue into the future.”

The younger Altman has appeared in the past on platforms such as She is represented by Ryan Mahoney, whose Illinois-based firm specializes in matters including sexual assault and harassment.

The lawsuit seeks a jury trial and more than $75,000 in damages.

In a joint statement to X with his mother Connie and brothers Jack and Max, Sam Altman denied the allegations.

“Annie has made deeply hurtful and completely untrue allegations about our family and especially Sam,” the statement said. “We have chosen not to respond publicly out of respect for their privacy and ours. However, she has now taken legal action against Sam and we feel we have no choice but to address this matter.”

Their response stated, “All of these allegations are completely untrue.” They added that “this situation is causing great pain to our entire family.” They said that Ann Altman faces “mental health issues” and “refuses conventional treatment and lashes out at family members who are genuinely trying to help.”

Sam Altman has gained international prominence since the debut of the artificial intelligence chatbot ChatGPT by OpenAI in November 2022. Supported by MicrosoftThe company was most recently valued at $157 billion, with financing provided by Thrive Capital, chip manufacturer Nvidia, SoftBank and others.

Altman was briefly ousted from the CEO position by OpenAI’s board in November 2023, but was quickly reinstated due to pressure from investors and employees.

This isn’t the only lawsuit the tech executive is facing.

In March, Tesla and SpaceX CEO Elon Musk sued OpenAI and co-founders Altman and Greg Brockman for breach of contract and fiduciary duty. Musk, who now runs a rival AI startup, xAI, co-founded OpenAI when it began as a nonprofit in 2015. Musk left the board in 2018 and publicly criticized OpenAI for allegedly abandoning its original mission.

Musk wants to prevent OpenAI from developing into a for-profit company. In June, Musk withdrew the lawsuit, originally filed in San Francisco state court, and later refiled it in federal court.

Last month, OpenAI countered Musk, claiming in a blog post that Musk in 2017 “not only wanted, but actually created a for-profit organization” to serve as the company’s new structure.

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