Alan Osmond's son, American Idol alum David Osmond, is remembering his late father and reflecting on their shared multiple sclerosis diagnosis. "Last night, my dad passed away. To be honest... I'm still trying to process it," David, 46, shared via Instagram on Tuesday, April 21, alongside multiple photos of him and Alan, who died on Monday, April 20, at age 76. "It's hard to put into words what a life like his really means. He wasn't just my father.