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The stranger said that his data matched hers in a way that could only mean one thing: he must be her genetic sibling.

The source also told the magazine that Williams’ eldest, daughter Matilda, whom she had with late “Brokeback Mountain” co-star Heath Ledger, “has been doting on her younger siblings.”

Justin and his two older siblings lived in a different home with a foster mother.

Soon after that, his brother and sister were sent to live with their uncle in California, while Rafael — or Rafa as his siblings call him — remained the ward of an orphanage in Mexico.

“It’s as much fun as it looks,” he says, adding that he can’t really give advice to his former small-screen sibling about treading the boards.