What is going on in the book Summer boys?

jamie is staying with her dad's younger brother and his wife, uncle carr and aunt claire. ella and kelsi are staying with their dad. beth is staying with her parents, and her dad's name is gary. so right now, peter and kelsi are together, but ella has this huge crush on peter. beth is crushing on her best friend, george, but he has no idea. he's off in lalaland with diet vanilla coke girl, cara. (who you'll meet in a coupla pages) and beth is totally in love with ethan, a boy from the summer before, but he seems to be avoiding her. hopethishelps(: