What is this movie called?

It has got George Clooney in it and his ex wife dumpes their daughter on him on day, their is also another women in it who has a son called sammy who always get things stuck up his nose! they are both single parents and they meet for the first time when they take there children to school but they dont get them their because the school has went on a boat trip or something. They argue all day and then they fall in love. I really want to watch this film because i thought it was great. thanks to anyone who answers.