DEAR ERIC: My sister and I were once best friends. She has a friend from high school who was also her best friend. This friend and I have always gotten along and enjoyed each other’s company.

The friendship has progressed, and my sister feels jealous and threatened by it. I live on the West Coast, and they live in the Midwest.

The friend has wanted to come visit me and has expressed the desire often. Now my sister is beside herself thinking this friend is trying to take her place. I have reassured her many times, that is not possible. Now my sister isn’t talking to me. What to do?

—Only One Sister

DEAR SISTER: It sounds like a visit might be in order for you. Your sister’s emotions are hers to manage, but you can give her a hand by talking this out in person. Jealousy is natural; we al

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