Tesla CEO Elon Musk has filed a lawsuit against his on-and-off girlfriend, musician Grimes, to establish a parent-child relationship with their three children. Musk claims that Grimes relocated to California to avoid Texas courts, where they previously lived. The lawsuit aims to secure Musk’s parental rights and access to their children. Grimes has responded by filing her own lawsuit seeking physical custody and a restraining order to prevent relocation.