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Travolta got his sister a small role in the film.

That same clout also came in handy when Travolta asked if his sister, Ellen, could have a small part in the film.

She's an actress in her own right, but it was her brother who put in the good word for her with the "Grease" production team.

Ellen told The Spokesman-Review in 2018 that she was visiting the set one day when her brother asked if she wanted to be in the movie.

" … So the next day they wrote me in a part," she told the publication. "That's how loose it was, and never knowing the success it would become. I get residuals every 13 weeks for 40 years. And I only worked two days, maybe one day, with Joan Blondell and that group, and I had a lot of fun."

Ellen played one of the waitresses watching the high-school dance contest on TV. Her big line was, "Oh, there's Danny and Sandy."

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