Elon Musk 's father said he isn't proud of tech billionaire son alone adding that his whole family have "been doing a lot of things for a long time".
He said Elon's younger brother, Kimbal was his "pride and joy" but acknowledged that Elon had "surpassed the mark".
Errol Musk was speaking on Australian radio program, The Kyle and Jackie O Show, as part of a 20 minute interview.
Asked whether he was proud of Elon, the 76-year-old said: "No, well, you know, I mean, we are a family that have been doing a lot of things for a long time. It's not as though we suddenly started doing something."
As reported by Business Insider, Errol told the radio show that his children, Elon, Kimbal, and Tosca, had joined him on travels around the world since they were children, visiting places like the Amazon rainforest and China.
"They've seen a lot of things, and we've done a lot of things together," he said.
"But Elon has in fact sort of really surpassed the mark."
He said that his son wasn't "as happy as he'd like to be" as he "feels like he's behind schedule" with the various companies he owns.
"Where he is now, he would have liked to have been there five years ago," Errol said in the interview, which lasted 20 minutes.
He told the presenters Elon had hoped to launch SpaceX's Starship spacecraft a while a go.
"He is frustrated with progress and it’s understandable. I know it sounds crazy but we tend to think like that as a family.
He added: "He’s 50 now and I still think of him as a little boy. But he’s 50, I mean that’s an old man."
Errol explained that Kimbal is also a billionaire, although not in the same stratosphere as Elon, who Bloomberg Billionaire Index believes is worth $260 billion (£211 billion).
Business Insider, however, pointed out that a 2021 Forbes article put Kimbal's net worth at around $700 million (£560 million).
In the interview, Errol said his younger son had been lucky in his marriage to Cristiana Wyly as they spent a lot of time together.
He told the show he was concerned Elon was struggling to find someone who would give up a career for him.
Elon has married three times, once to his first wife Justine Wilson and twice to Talulah Riley.
He has had romances and relationships with various celebrities, among them actor Amber Heard and musician Grimes.
Errol became more positive about his oldest son towards the end of the interview, saying: "He’s a very, very nice person.
"He loves people, he loves humanity."
Errol has seven children– Elon, Kimbal, Tosca, twins Asha Rose and Alexandra, Elliot, and a new arrival, whose name hasn’t been revealed.
