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Jack Osbourne wants to teach you about multiple sclerosis Jack Osbourne wants to teach you about multiple sclerosis. Jack Osbourne found out he had multiple sclerosis just three weeks after having his daughter. You Don't Know Jack About MS. The youngest child of Ozzy Osbourne is all grown up, and he's a man on a mission. Producer/director Jack Osbourne learned in 2012 that he had multiple sclerosis, and soon after, the TV personality decided to turn his diagnosis into an informational campaign for other MS patients and their families. Its name? You Don't Know Jack About MS. The former Osbournes star admits that he certainly didn't know jack about the disease when he was first diagnosed, and now he wants to make it easier for patients to learn about MS through a fun, personal video series and website. Osbourne talked to CBS News about his campaign.