Mitch Winehouse has said that Amy, the documentary film about his daughter Amy Winehouse, has been edited to show him "in the worst possible light".
Having previously labelled Amy "tainted", he now claims the filmmakers edited his comments about the late singer's need to enter rehab.
"It was 2005. Amy had fallen - she was drunk and banged her head," Mitch explained in an interview with The Guardian.
"She came to my house, and her manager came round and said, 'She's got to go to rehab'. But she wasn't drinking every day. She was like a lot of kids, going out binge-drinking.
"And I said, 'She doesn't need to go to rehab'. In the film, I'm relating the story, and what I said was, 'She didn't need to go to rehab at that time'.
"They've edited me out saying 'at that time'."
Amy Winehouse recounted the incident in her 2006 song Rehab.
Mitch also recalled the first time he saw the documentary, calling the experience "horrible".
"I told [the filmmakers] that they were a disgrace. I said, 'You should be ashamed of yourselves. You had the opportunity to make a wonderful film and you've made this'."
The makers of Amy have claimed they entered the project "with the full backing of the Winehouse family and we approached the project with total objectivity".
"We conducted in the region of 100 interviews with people who knew Amy Winehouse . . . the story that the film tells is a reflection of our findings from these interviews," they added.
Amy opens on July 3, with a premiere at the Cannes Film Festival later this month.