Jack Osbourne told People.com he has been diagnosed with multiple sclerosis, a disease affecting the central nervous system.
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"I've got a family and that's what's supposed to be the most important thing."
Osbourne is the son of rocker Ozzy Osbourne and "The Talk" co-host Sharon Osbourne.
He and his fiancee, actress Lisa Stelly, became first-time parents to a daughter, Pearl Clementine, in April.