Maye Musk is not your typical billionaire’s mother. At 76, she’s still sashaying down runways, gracing magazine covers, and advocating for healthy living with the energy of someone half her age.

Maye. He is thought to have fathered at least 13 children, three of them with Canadian musician Claire Boucher, who performs as Grimes. The petition to revoke Musk’s citizenship was initiated on ...