Billionaire Elon Musk’s father Errol Musk claims that the baby he had with his own step-daughter was the result of a ‘one-off mistake’, in the potential source of the feud between the family. Tesla Motors CEO, SpaceX Founder, and owner of X (formerly Twitter), Elon Musk is never short of controversial headlines. No longer the richest man in the World, Musk still has a staggering net worth of over 212 billion dollars. The celebrity, not short of public Hollywood feuds, is also claiming he will fight competing social media giant Mark Zuckerberg in a live-streamed cage-fight. The father of 12 chi…