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

Dear Prudence,

My husband used to date my older sister, “Rochelle,” when they were in college (back then I was in high school and only met him briefly twice). It didn’t work out due to her numerous substance abuse issues, plus her penchant for shoplifting. We ended up getting together when we ran into each other some years later while we were in NYC on business.

The problem is that within the last year, Rochelle has decided she wants him back and shows up drunk and pleading at our house at least once a week. Well, I had a baby last month and have reached my absolute limit.

I told my sister the next time she shows up, I’m taking out a restraining order on her. My parents, however, are begging me not to, as Rochelle

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