Grimes sent out a panicked message to Elon Musk about their child's 'medical crisis' as the billionaire wielded a chainsaw onstage. She has previously fought with the Tesla and SpaceX CEO over custody of her children, and it is unclear which of their children is in 'medical crisis'. Grimes is the mother of three of Musk's 13 known children - four-year-old X Æ A-12, three-year-old Exa, and two-year-old Techno. Read the full story on DailyMail.com. Link in bio. #news #america #grimes #musk #usa #music #drama