Trying to find a movie

Hello , I’m looking for a movie where there’s a man who goes back home after his father dies only to find out that his mom is going away to j think rehab or some kind of wellness spa and wants him to watch over/ raise his young sister for the time being while their mother is away … after they spend time together eventually he wants custody cuz they bond and he thinks the mom isn’t the best fit … that’s all I can remember the main man kinda looked like Ryan reynolds I can’t remember the actors but I don’t think it’s him movie was made somewhere between 2000-2010/16