We are Family (2006)

Original title: 左麟右李之我愛醫家人

Alan Tam plays as many as four roles in the film: a guy always in baseball cap, a man resembling the legendary Wong Fei Hung, a sloppy middle-aged man with a big belly, and even an eighty-year-old lady! Hacken Lee is an up-and-coming office manager named Kit who is about to marry his flight attendant girlfriend. However, her family members - all played by Alan Tam - are pretty strict when it comes to choosing the right husband for her!