Jack Osbourne reveals how he used his multiple sclerosis diagnosis to help his father Ozzy through his journey with Parkinson's disease, Friday on "The Talk@Home." "I think it's a very different thing with Parkinson's versus MS, but the one thing that I've always encouraged from the jump was, you know, you can kind of turn lemons into lemonade with this. And, just be honest and be that person that someone in the middle of nowhere, who's got no one, can look to for inspiration. It takes a lot of guts to come out and go hey, you know, I've got this thing wrong with me and it sucks, but I'm dealing with it. People can relate to that. People may not be able to relate to my dad as a musician or being a world renowned rock star, but now that person with Parkinson's can go, oh wait, I can relate to this man because he's dealing with the same thing I am, and that's giving me hope." Osbourne becomes emotional recalling a turning point in his dad's recovery, while watching him at daughter Pearl's school performance where she performed his hit song "Crazy Train." "That was kind of like a marker for my dad. It was like, hey, you've had this bad fall; you've had the surgery; your Parkinson's is kind of in a flare up. And it was like, you need to be better enough to come. That's the goal. And he did it. And it was one of those things, and I talk about it in the film ["The Nine Lives of Ozzy Osbourne"], I never thought I'd be at my kids school with my dad, I'm getting emotional."