I have a sister who is older by about 15 months. According to all those birth-order books, our personalities are more reversed because she was always needier than I was, which created a codependent relationship between her and our mom. My sister and I fought like crazy - I was jealous of the attention she got from parents and how smart she was, and she was jealous because I always healthier, had lots of friends and boyfriends and eventually married and had a child. She could be pretty nasty - I even found out that she was telling her students through the years that I fried my brain on drugs and ruined my life by making poor decisions. Then when my son was school age, she started telling him the same, including things like he didn't have to listen or obey me because I make bad choices. That's when I decided she didn't get to do that anymore. We have not had a relationship for about 17 or 18 years.