Dear Queenie,
My sister stopped speaking to me a couple of years ago because I dated her best friend for a while and then we broke up. There wasn’t any big fight or anything, we just sort of cooled off with each other. Her friend and I are still on good terms, we just aren’t together anymore. But my sister still isn’t talking to me.
Queenie, I didn’t do anything to either of them. Why can’t my sister get over it?—Estranged brother
Dear Brother,
I am guessing your sister was hoping you would make her friend her sister(-in-law) and was terribly disappointed when that did not happen. However, her reaction was, and still is, irrationally out of proportion. All you can do is hope she will get over it with (probably a very, very long) time.