A documentary that premiered Wednesday at the Cannes Film Festival alleges that Whitney Houston was molested as a child by singer Dee Dee Warwick, who was her cousin and the sister of hitmaker Dionne Warwick .

Kevin Macdonalds Whitney dropped the bombshell revelation about three-quarters into the film, according to The Associated Press.

Houstons half-brother Gary Garland was first to tell Macdonald of the abuse, and said he was molested as well, the director told Indiewire. Pat Houston, who was Houstons sister-in-law and manager, corroborated the claim.

Macdonald said Houstons aunt and longtime assistant Mary Jones later provided additional details of the abuse, which she said Houston had confided to her. It was Jones interview that changed the direction of the film at the last minute.

She told me Whitneys point of view on this, and what Whitney had told her in detail, and how important she felt it was for understanding Whitney, but how scared everyone was to talk about it, Macdonald told Deadline. So, yeah, the film changed radically in the last weeks of editing it, which I guess, as a detective, is the result you want.