In 1939, Delon was four years old when his parents divorced. Both of his parents remarried, as a result he had two half brothers and an adopted sister on his father’s side, and two half siblings on his mother’s side. He was then entrusted to a foster family, which would remain for him a childhood wound that never healed. The father of this family was a prison guard in Fresnes Prison, Val-de-Marne. Delon, who lived next door, heard the salvo that executed the wartime collaborator Pierre Laval in the prison courtyard in 1945, the details of which he was told. While living with the foster family, Delon became passionate about bicycle racing and hoped to become a bicycle racer like Fausto Coppi.
On 5 July 2023, his three children filed a complaint against the actor’s companion Hiromi Rollin, alleging psychological harassment, interception of correspondence, animal cruelty, intentional violence, unlawful confinement, and abuse of weakness. According to Anthony Delon, his father requested in writing that Mrs. Rollin leave the residence in Douchy-Montcorbon. A preliminary investigation was opened on July 6. On July 7, Yassine Bouzrou, lawyer for Hiromi Rollin, stated that she disputes “the entirety of the facts”. Bouzrou added that she would file a complaint against members of the Delon family and their bodyguards for aggravated voluntary violence suffered by Rollin on July 5, 2023.