A new investigation from The New York Times details multiple child sexual abuse allegations against Elon Musk’s estranged father, businessman Errol Musk.

The report lays out allegations he abused five of his children and stepchildren, citing police and court records, a collection of over 50 emails, text messages, personal notes and letters, as well as interviews with social workers and family members.

Errol Musk has at least nine children and stepchildren, the eldest of whom is billionaire Elon Musk.

He has been married to three women. The allegations largely come from his children and former stepchildren with his third wife, Heide-Mari Bezuidenhout.

In 1993, Errol Musk’s then 4-year-old stepdaughter told her aunt that he had touched her. In another incident a decade later, that stepdaughter said she found him sniffing her underwear.