Final chapter is on fighting. It's not really something I can summarize -- except the fact that when kids aren't breaking any serious rules (aka, hitting, name calling or getting dangerous) they should solve their problems on their own.
Lately I think we've relied too much on the whole "flip a coin" strategy, and after realizing this I am aware it's better to have them figure out a solution their both happy with.
Huge fan of the Siblings Without Rivalry book. I highly recommend. Now to How to Live with your Children and Like them.