David Gest said his new film about Michael Jackson will "set the story straight" about the pop legend.
Gest, who produced the film which was released on Monday, was joined at its London premiere in Leicester Square by Jackson's brother Tito and his sister Rebbie.
She admitted to being moved to tears by the film which she said was an "honest" portrayal of her brother.
Dozens of fans, including many dressed as the star, gathered at the red carpet.
Gest said: "I woke up one morning and said I'm going to make a movie about Michael's life because I was tired of reading all this c*** about him, all these tales that were so fictitious, and I thought let's set the story straight but let's give the people a movie that says something new. Not the same rehash, the same moves and that's what I did."
Speaking earlier this week, Rebbie said her brother's children talk about their father every day.
Prince Michael, Paris and Blanket have been in the care of their grandmother since the pop superstar's death in 2009, but Rebbie said their memories of him are still fresh.
"Every day, all the time when I'm around them, they say, 'Dad used to do this, Dad used to say it like that'. You hear it all the time," she said.
Rebbie said the children had also been coping well with the ongoing trial of Jackson's physician Dr Conrad Murray, who has pleaded not guilty to involuntary manslaughter over the singer's death.
"I've been around them and seen how they are and they are aware of it. They're dealing with it OK from what I understand, what I've seen, as best can be expected," she said.