This is the South African engineer's seventh child. He shares Elon, Kimbal (the entrepreneur targeting the US's reliance on fast food) and daughter Tosca, a film producer and director, with first wife and high school sweetheart Maye Musk.
He also has two children with Heide Bezuidenhout, who has two children from a previous marriage, including Jana, whom he wed after his 1979 divorce to Maye.
Errol's elder children were reportedly furious to learn of his relationship with Jana, with the 76-year-old confirming that his other daughters still found it “creepy” and are still not comfortable with it.
His relationship with Elon meanwhile, remains estranged, according to the site, with the SpaceX boss previously branding his father a “terrible human being”.
Despite this, the two seem to share a common goal to “help the underpopulation crisis”, as Elon quipped on Twitter after the news of his twins' birth.
Reports emerged earlier this month that the SA-born billionaire secretly welcomed twins with a top executive at one of his companies back in November. He also has eight other children from previous liaisons.
His daughter, Vivian Jenna Wilson, was recently granted her request to legally change her name and gender recognition.
The 18-year-old filed a request to change her name in accordance with her new gender identity and because “I no longer live with or wish to be related to my biological father in any way, shape or form”.
Support independent journalism by subscribing to the Sunday Times. Just R20 for the first month.