I’m looking for the title of a movie where the premise is that the two main characters are at a fancy British estate at a wedding and they are pretending that one of them is related to the family when he is really just a friend. I think the purpose is to try and secure some sort of inheritance or family ties to the owner of the estate. The impostor keeps pressing his luck in a slightly comedic way and the main characters are eventually found out by the family. The father then takes them down to the basement threatening them but doesn’t end up hurting them very much. I believe this movie came out sometime in the last 15 years. The title might be something simple like one or two words long.