Serena and Venus Williams' half-sister Sabrina slammed the biopic in an interview with The Sun.
Sabrina said Richard Williams abandoned her family when she was 8 years old.
She also said that Will Smith should be "ashamed of himself" for appearing in the film.
Serena and Venus Williams' half-sister Sabrina Williams spoke out about their father, Richard Williams, in a recent interview with The Sun.
Sabrina, 57, slammed "King Richard," the biopic about her estranged father and accused the director Reinaldo Marcus Green of leaving out Richard's first family, whom she says Richard abandoned. Richard is portrayed by Will Smith in the film, which was released on November 19.
"It's a comedy, no?" she told The Sun's Niamh Cavanagh. "How can you make a movie by telling half the story?"
"It suddenly starts with dad and his new wife Oracene and their children. It's like nothing happened before," she continued.
"I think the title is completely over the top," Sabrina said. "He thinks he's the king of the world, but no one that's ever been around him thinks he's King Richard. It is an outrageous title, but to truth be told, it fits him."
In the early 1960s, Richard, now 79, and Sabrina's late mom Betty Johnson married in Los Angeles and had five children: Sabrina; Richard III, 56; Ronner, 55; Reluss, 54; and Reneeka, 49, The Sun reported.
Sabrina told The Sun that she was 8 and her younger sister was 8 weeks old when Williams said he was leaving the house to buy her a bike. She said he never returned and went on to make a new life with his second wife, Oracene, Venus and Serena's mother. Sabrina said she has seen her father only a few times since then.
"Truth be told, those girls rose to the top while his other children had to suffer because of the choices my dad made, we were raised in poverty after he left," she told the outlet.
"He's not the king of the world," Sabrina continued. "If you look at him psychologically, it's something he's never achieved apart from in his head, he's lived only through two of his daughters forsaking all his other children."
Sabrina told The Sun that she held Smith "in a deep regard, but, as a black American, he should have wanted to tell the full story," adding that he should be "ashamed of himself."
Sabrina also said she no longer holds any anger toward her dad and attended counseling to deal with her unresolved feelings toward him.
She said she doesn't believe she will ever meet her half-sisters but that she would love to meet her niece, Serena's 4-year-old daughter Olympia.
Representatives for Venus and Serena did not immediately respond to Insider's request for comment.
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