My sister brought her 7-month-old baby to my adults-only wedding, despite promising she wouldn’t. The baby cried through my vows, and although I stayed calm, I never forgot how she completely disregarded my boundaries. Five months later, she invited me to her son’s first birthday—a picture-perfect event with a strict “baby-friendly” theme, tons of moms, and a professional photographer.

When I arrived, her smile dropped. I walked in wearing a blush gown, looking flawless… and carrying a golden retriever puppy dressed in a baby onesie. I proudly announced, “You said this was a baby-friendly party. Goldie’s my fur baby.” The kids adored him, the photographer took more photos of Goldie than the birthday boy, and my sister was furious. I simply said, “Relax—you’ll understand when you have a puppy.”

After the party, I sent her a photo from my wedding: her holding her screaming baby during my vows. My caption read, “Not so fun when someone brings an uninvited plus-one, is it?” She stopped speaking to me immediately. My parents are angry too, saying I ruined the party and made it all about myself. Maybe my move was petty—but no one seems willing to admit she did the exact same thing to me first.

Now I’m wondering if I really crossed a line, or if giving her a taste of her own medicine was justified. I didn’t hurt anyone, the kids had a blast, and a one-year-old won’t remember a thing. But somehow, the entire family is acting like I committed a crime instead of mirroring her behavior back to her. Was I truly wrong?