In "Gray Matters", who played Gray, the character inspired by the director's sister?

In Gray Matters, Heather Graham played Gray, the character inspired in part by director Sue Kramer’s sister.

Gray Matters is a 2006 romantic comedy written and directed by Kramer. Heather Graham plays Gray Baldwin, a New York advertising executive whose understanding of her sexuality changes after she and her brother, Sam, become attracted to the same woman. Tom Cavanagh plays Sam, while Bridget Moynahan portrays Charlie.

The film’s premise draws partly from Kramer’s relationship with her sister, Carolyn, who was one inspiration for the story. Gray is not presented as a literal biographical portrait; the character combines elements of Kramer and her sister. That distinction sometimes causes confusion when the film is described as being “based on” the director’s sister.

Graham was already known for roles in films such as Boogie Nights and Austin Powers: The Spy Who Shagged Me. In Gray Matters, she carries the title role and the film’s central emotional perspective, making her the canonical answer to the question.