Can you suggest any good, fairly nonviolent multiplayer games for ps3?

So I’m planning on buying a PS3, and I’m a fairly hardcore gamer. I love playing the multiplayer mode in Modern Warfare 2 at my friend’s house, but my parents forbid me from buying it. They don’t mind me playing it, but they think that it’s too violent for my 9-year-old brother to watch. I’m planning on getting LittleBigPlanet 2, but can you suggest any multiplayer versus types of games that aren’t too violent? Oh, and I don’t like sports games.
Halo would be perfect, but I’m not getting an Xbox.