Jack Osbourne, son of Black Sabbath and solo career legend Ozzy Osbourne, has revealed that he has been diagnosed with multiple sclerosis. The 26-year-old Osbourne, who only weeks ago became a father for the first time, has vowed to fight the disease: “‘Adapt and overcome’ is my new motto.”

Speaking to Hello! Magazine, Osbourne explained that a frightening episode in which he lost most of the vision in one eye sent him to the hospital, where tests revealed his condition. Although quite naturally dealing with feelings of anger and sadness — “I kept thinking, ‘why now?’” — Osbourne is determined to maintain a positive outlook. His plan to fight the disease will include drug treatment, holistic therapies and lifestyle changes.

Multiple sclerosis is an incurable autoimmune disease that attacks the brain and central nervous system. The effects differ with each person, ranging from minor problems to serious disabilities, with most people falling in between.

Ozzy and his wife Sharon are said to be devastated by the news, with the singer declaring, “If it was me, you’d think: ‘Ozzy had a reputation and it caught up with him’, but Jack is such a good guy.” His sister Kelly took to Twitter with a loving request: “Please support my brother @mrjacko in not only his bravery but honesty! i love you so much jack & I’m so proud of you!”

As news of Osbourne’s diagnosis broke overnight, the extreme sports enthusiast and budding documentary filmmaker thanked fans for their flood of support on Twitter: “Thank you all so much for the kind and inspirational words. It means a lot. ‪#adaptandovercome‬.”