Woman’s behavior negatively influences nieces

DEAR HARRIETTE: I have been fighting with my sister about her behavior around me and my family for years, and it’s reached a breaking point. I have two daughters, ages 7 and 9, and every time their aunt comes to visit, I’m left feeling frustrated and upset. My sister has a habit of using crude language, making inappropriate jokes and displaying poor manners, even when I’ve asked her repeatedly to tone it down around the kids. What makes this even more difficult is that my girls adore their aunt. They look up to her, and her behavior is starting to rub off on them.