Elon Musk's eldest daughter found out about her new half-sibling online.
Conservative influencer Ashley St. Clair claimed a few days ago she had given birth to the Space X founder's 13th child five months ago and 21-year-old Vivian Wilson - who the tech mogul has with ex-wife Justine - has joked it isn't the first time she hasn't been told directly what is happening in her father's personal life.