I am like that with my sisters. I actually disapproved of her husband and demanded him get out of our family, and it caused big problems between me and my sister and drew them closer together (I was wrong, I should have kept my mouth shut). But she's my baby sister and I felt that he was not treating her right (she was crying to me just about everyday). Any way that was last summer and since then our wounds have healed and she's my best friend again. Her husband straightened up and got his act together (I can't take credit for that). I'm a very over protective oldest sister and it's just part of our makeup (mine anyway). My Aunt calls me mother hen. Your sister's just worried about you, she doesn't mean any harm.