When my sister Sue begged to use my house for her son Ethan’s birthday, I agreed, even though I’d be out of town. She couldn’t fi twenty kids in her tiny apartment, and my place had a pool and yard. To help, I left snacks, decorations, and a $400 Harry Potter LEGO castle wrapped for Ethan. When she texted me during the party—“You’re the best aunt ever!!”—I glowed with pride.

But when my flight got rescheduled, I came home early Sunday night. The first thing I saw was a sagging pink balloon arch, glitter in my flower beds, and a banner across my patio that read: “Congratulations, Jessica’s Baby Shower!” Inside, I found wine bottles, pink cupcakes, and a guest book embroidered with tiny footprints. Ethan’s gift was untouched. My sister hadn’t thrown a birthday party at all—she’d hosted a baby shower for someone I didn’t even know.

I called her immediately. Sue brushed it off like it was nothing: Jessica’s venue canceled, and “two birds, one stone.” But the real shock came from my neighbor, who mentioned Jessica had paid Sue $900 for “venue and catering.” That’s when it hit me: Sue had lied, used my house, and pocketed money—after I’d even given her $300 for “cake and juice boxes.”

When I confronted her, she rolled her eyes. “You weren’t even using the house. Why do you care?” Then she sneered, “You’re just jealous I made more in a day than you do in a week.”

I banned her from my home, but when I told our mom, she sided with Sue: “It’s just a party. Don’t tear the family apart.”

But this isn’t about money—it’s about trust. And Sue shattered it.