Tech billionaire Elon Musk's father, 72, has 10-month-old baby with 'stepdaughter' he's known since she was four

Errol Musk, the father of tech billionaire Elon, lives in South Africa

The 72-year-old father of tech billionaire Elon Musk has a 10-month old child with his stepdaughter, it was sensationally reported last night.

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."

Elon Musk recently described his father as "evil" and a "terrible human being"

When asked about the comments last week, Errol responded angrily, telling the Mail on Sunday his 46-year-old son needs to "grow up".

Speaking at his mansion in Western Cape, South Africa, he speculated that Elon was referring to the fact he was once acquitted of manslaughter after shooting dead three men who broke into his home.

And Musk senior also revealed his son's unhappiness that he fathered a baby with his 30-year-old model girlfriend Jana Bezuidenhout.

Referring to the unexpected birth of son Elliot Rush Musk, Errol said: "Of course, I love him dearly, even though it wasn’t planned.

"In my own cautious way I insisted on a DNA test to ensure he was mine.

"I told my daughter Ali about him because I thought she would be supportive and understanding.

"She said I was insane, mentally ill.

"She told the others and they went berserk."

Errol Musk, 72, is said to have known Jana since she was four-years-old

Now it has emerged that Jana is not only Errol's 'girlfriend', she is also the daughter of his former wife Heide.

A family friend said Errol has known Jana since she was four-years-old and that his former wife Heide has been trying to keep the scandal secret.

"There is not a lot of people who know this. We would actually like the facts to come out," a source told MailOnline.

Errol Musk, who is also a successful millionaire businessman, said he no longer considers Jana his stepdaughter.

He has been married and divorced four times and claimed he "barely remembers" Jana's mother Heide and would not know if he met her in the street.

Errol and Heide were married for 18 years and had two children together Alexandra 'Ali' Musk and Asha 'Rose' Musk.

Former Silicon Valley geek Elon has a complicated marital history himself.

He has already been married three times – twice in the space of three years to British St Trinian’s actress Talulah Riley.

The entrepreneur was raised by his engineer dad Errol and dietician and model mum Maye in South Africa before moving to Canada when he was 18 and then to the US once he graduated.

He has a younger brother Kimbal, also an entrepreneur and millionaire, and younger sister Tosca, a film producer.

Born in 1971, by the age of 10 – long before computers became mainstream child’s play – Elon showed an interest, and just two years later taught himself computer programming.

His first creation was a video game called Blaster, which, at age 12, he sold for £400. “I have two brilliant children, but Elon’s a genius,” said Maye.

“I can explain Tosca and Kimbal pretty well. I can’t explain Elon.”

Maye and Errol split when the children were young and they remained with their dad.

“I can explain Tosca and Kimbal pretty well. I can’t explain Elon.”

Maye and Errol split when the children were young and they remained with their dad.