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The Karate Kid Part III
Uncle Louie lived in Parsippany, New Jersey. He was first talked about in the first film, when a woman who lived in the "South Seas" apartment complex said to Daniel LaRusso she was a fellow New Jersey native from Parsippany. However, she did not know Uncle Louie as the "Louie" she spoke of was an unrelated man named Louis Fortini.
He was seen onscreen in the third film when he is bedridden from emphysema. Lucille LaRusso has returned to New Jersey to help care for her late husband's brother, and speaking on the phone thanked Kesuke Miyagi for allowing Daniel to stay with him. Mr. Miyagi ended the conversation saying it was his pleasure and asked her to take good care of Uncle Louie. Her goodbye was ended when Uncle Louie rang a bell.
Uncle Louie sired a son, also named Louis. The son eventually moved to California. The only time Daniel mentioned having an aunt was a woman named Tessie. It may have been possible she had been married to Uncle Louie, and passed away prior to the events of the first film.Although mentioned on the Cobra Kai TV series, it was strongly implied Uncle Louie was killed by emphazema prior to the debut of the show.