Comedy movie of th 2000's where a gandma smokes pot

Hi,

I cant remember the title of this movie. It was a comedy about a teenage girl and her family. I cannot remember much details but in this movie the girl'grandma was always on her side (and smoking pot all along the movie) while she have a more conflicted relation with her mother. I remember also the beguining af the film which open on a radio broadcast of rock music and that the speacker take the mic imitating a wolf scream...