Mel Gibson's 25-year-old son has reportedly cut ties with his family in a bid to battle substance abuse alone in rehab. Edward Gibson checked into California's Cri-Help clinic in late September (07) and has told staff he won't see visitors, according to the National Enquirer. The publication reports Gibson's son has been battling an addiction to cocaine and alcohol. A source says, "He's very self-conscious and finds it difficult to speak about his background, which is thwarting his recovery." The insider claims Edward - one of Gibson's seven kids - took the decision to seek help after fearing he'd kill someone by climbing behind the wheel of a car while drunk or high. A friend tells the Enquirer he insisted on cutting all ties to his friends and family because he doesn't want "any distractions". The source says, "He told a pal, 'I know my dad loves me, but this is something I have to do by myself for myself. My dad is just going to have to chill.'" And friends are confident Edward won't become another "victim". The insider adds, "He doesn't want to be written off as just another kid of a celebrity who spun out on drugs."