(CBS News) -- Jack Osbourne is thanking fans for their support following after he revealed that he had been diagnosed with multiple sclerosis.
"Thank you all so much for the kind and inspirational words. It means a lot," he tweeted, finishing the message with "#adaptandovercome."
The 26-year-old son of Ozzy and Sharon Osbourne told People he was diagnosed with the disease, which affects the central nervous system, two weeks after he became a first-time father (he and fiancee Lisa Stelly welcomed daughter Pearl in April).
"I was just angry and frustrated and kept thinking, 'Why now?'" he told the magazine. "I've got a family and that's what's supposed to be the most important thing."
One of the people who sent a heartfelt message to the former reality star was his sister, Kelly Osbourne.
She tweeted, "Please support my brother @mrjacko in not only his bravery but honesty! i love you so much jack & I'm so proud of you!"