I love my boyfriend's family. They are really great people, especially his sister, who is 15 years old. In fact, she's like a sister to me now. But I hate the way she talks to my boyfriend, her older brother. He goes out of his way for her because that's what big brothers do, but it's like she doesn't appreciate any of it. Out of nowhere she'll just boss him around or yell at him for no reason, and he always puts up with it.

When I talk to him about it, he tells me that it's just how siblings are, and that he can't get mad at his little sister. My boyfriend is about to turn 20 and has his sister bossing him around like he's on a leash. And she always wants me to choose a side when they disagree on something, and I can't do that. I'm the youngest in my family and have two older brother who are in their mid-20's, and I would never speak to them like that. I'm so fed up that I don't even want to go their house. Should I step in and say something? What should I do?

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