Family comedy starring twin sisters Tia and Tamera Mowry, who gained fame in the US on the sitcom 'Sister Sister'. Seventeen-year-old Sydney (Tia Mowry) is having a hard time adjusting to life in a new town after her family's move from California to Connecticut, although her twelve-year-old brother Willie (Tahj Mowry) is quite happy so long as he can carry on with his wacky scientific experiments. When their divorced grandparents, Cat (Hope Clarke) and Gene (Robert Hooks) come to stay, they both inadvertently use a bar of soap that contains a formula Willie has invented to defeat the ageing process... and instantly turn back into their seventeen-year-old selves (Tamera Mowry and Mark Taylor). The pair have a great time reliving their younger days and falling in love all over again - until Willie discovers that his formula has potentially deadly side effects. He must work quickly to find an antidote to restore his grandparents to their older, but healthy bodies - but will they agree to become old again so soon?