A Movie About A Family Band

I'm trying to remember a movie about a family band, It was dark from what I remember. Not to dark but it wasn't PG. From what I remember the family was perfect from outside but not so good out of the public eye. It is killing me it's on the tip of my tongue, I was pretty young when I saw it. I've tried google IMDB but can't find it. Any help would be extremely helpful, so I can sleep tonight.