Bachelor Father - The Blonde Issue

Never-married attorney Bentley Gregg took on the task (with help from his "houseboy", Peter) of raising his young niece Kelly, after her parents died in an accident. The job was easier when Kelly was a little girl, but now she's in her teens, and beginning to date and venture into the adult world, while Bentley continues to juggle his career, looking after Kelly, and his own romantic life.

After Uncle Bentley says absolutely not to Kelly's request to dye her hair blonde, she makes a bet with him that if there's evidence that his redheaded girlfriend dyes her hair, then Kelly can dye hers, too.