Should I Invite My Sister's Married Boyfriend to the Wedding?

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Crashing cousins? A scandalous sister? A few too many besties? Lisa Birnbach, author of The Official Preppy Handbook, helps you navigate often-rocky wedding waters. Her tips will help you keep your sanity intact—and your wedding guests happy.

My sister is dating a married man—and not just any married man, but the stepfather of a friend I plan to invite to my wedding. Is it OK to tell her she cannot bring him? —Kristi B. of Tulsa, Okla., via email

Dear Kristi,

Planning a wedding is hard enough without having to deal with your sister's bad judgment. You are absolutely right—you should not allow her to bring her married boyfriend as her plus-one, and I'd be very surprised if she gave you a hard time about it. She has to know she's in shady territory here, and I doubt that her paramour would want to attend your celebration unless he wants to get caught. If you are worried that your sister will have a problem with your decision, blame it on us.

—Lisa Birnbach

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