Your sister didn't come with a rulebook, did she? What's fair and what's not fair probably resulted in one or both of you running to your parents to take sides. Now that you're older, you likely call on your friends or partner to back you up when one of you feels "wronged."

But what if there was a set of rules you could follow so you know exactly who has crossed the line . . . this time? Now, with "Sister Rules: 144 Ways to Be a Good Sister, " there is.

Liz has put in over 20 years developing these tried-and-true guidelines so that sisters...