A red-carpet premiere is planned for the film - Sparks tweeted that she's getting a dress custom-designed for it - but a report suggests that Houston's family is making things difficult in terms of scheduling.
While premieres normally take place at least a week before a movie opens, Showbiz411.com claims that the film's premiere is tentatively scheduled for the day before the movie hits theaters because of Houston's family's demands.
Sources tell the website that the family doesn't want the premiere to be held on any date that's near August 9, which would have been Houston's 49th birthday.
In addition, sources tell Showbiz411.com that the question of which family members will be attending, including Houston's daughter, Bobbi Kristina Brown, and her mom, Cissy Houston, is also "very much up in the air."
On top of that, the location of the premiere is upsetting the family. "I'm surprised they're having it in Los Angeles, where Whitney died," said a source. "They should be having it in New York."