Harry styles is my babysitter!?! (on hold)

Rosie is an average 15 year old girl, lives in a small town called Holmes Chapel in Cheshire. And her little sister Kaliegh, who she loves dearly. Her mum is apparently always working out of town, more like on vacation. Rosie know her mum don't work or even have a job for that matter. So what happens when her mum hires a baby sitter for the first time. And what if his name his Harry Styles??!!