People say things to me like, "but she's your mother; but i'm your brother." It occurs to me now that no one had ever said, "but that's your father." I'm beginning to think these things are only said when the person mentioned has failed to create and maintain any kind of reasonable relationship with us, because otherwise we don't hear any complaints or judgments about how we're acting. Your interpretation of their remark is that you should let things slide; I was like, so what are you saying?? It turned out the speaker was presuming a bond that was never formed. So maybe all brothers tease their little sisters; some brothers also are kind to them or somehow form that bond. I'm guessing; I don't know from personal experience of brother nor mother.