Dog Days. by Jeff Kinney

This is the next mega-selling instalment in the hilarious "Diary of a Wimpy Kid" series. Greg's mom has a vision of 'family togetherness' that really doesn't sound a whole lot of fun. But there's a brand-new addition to the Heffley family to contend with and it looks like Greg might be outnumbered. It could be a real dog of a summer.