The revelation is thought to be the reason behind a bitter family feud which Elon, one of the richest men in the world, recently spoke about candidly.
In a tearful interview with Rolling Stone, the Tesla and SpaceX boss described his father Errol as "such a terrible human being, you have no idea."
He went on: "My dad will have a carefully thought-out plan of evil. He will plan evil. Almost every crime you can possibly think of, he has done. Almost every evil thing you could possibly think of, he has done. It’s so terrible, you can’t believe it."