When 17-year-old Sydney's divorced grandparents visit simultaneously; it seems there will be no end to the bickering. Then little brother's science experiment goes awry and instead of preserving roses; he sends both grandparents back to their youth. The young-people-out-of-time story line leads to many "young fella" versus "dissing" language gags. Then doe-eyed grandma gets an eye-opening school lecture on the use of a condom--a funny; but unnecessary scene that gives the movie its Parental Discretion rating for language and mature subject matter. Of course young grandma Cat (Tamera Mowry) looks exactly like Sydney (Tia Mowry); resulting in the inevitable dating mix-ups; until young Grandma and Grandpa predictably fall back in love before literally plunging back into old age. This 93-minute Showtime vehicle for the Mowry twins (TV's Sister; Sister) and their brother Tahj is better than average; although its "street" savvy may leave older teens and true urbanites wincing. Ages 12 and up. --Kimberly Heinrichs