Dear Prudence is Slate’s advice column. Submit questions here .

Dear Prudence,

My sister, “Priscilla,” ended her marriage with my former brother-in-law due to his serial adultery. Last month, she received the news of his death. They had been divorced for 15 years, but there was no love lost between them. His funeral was two weeks ago.

I did not expect her to attend, but I did so that I could be there for my niece and nephew and their families. However, Priscilla pulled a stunt that left them beside themselves with fury.

When everyone assembled in the cemetery for the graveside service, we were shocked to see a plane skywriting a message overhead that ultimately ended up reading, “Good Riddance!” Initially, we had no idea who was responsible until I told my sister about it, and

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