When my daughter-in-law Brittany asked me to babysit my grandson Noah for the weekend, I expected cuddles and cookies — not a handwritten bill for eggs, water, and toilet paper.

Despite our rocky relationship and her obsession with “boundaries,” I agreed, excited for time with Noah. But when I arrived, the house was a mess, the fridge nearly empty, and there were barely enough diapers. I cleaned, shopped, cooked, and poured my heart into making the weekend special.

Monday morning, I found Brittany’s “invoice” for $40, with a cheery “Please Venmo by Friday.” I was stunned — and then inspired.At home, I drafted my own bill: Grandmother Services Est. 1993 — detailing 18 years of raising her husband with a running total of over $200,000. After a generous “family discount,” I left the balance at $40 and delivered it in a gold-trimmed envelope.

Not long after, Ethan called, half-laughing, half-apologizing. He hadn’t known about Brittany’s bill — and fully backed me up.A week later, Brittany Venmoed me the $40 “to settle her debt.” I laughed — then donated the money to a children’s hospital in Noah’s name.Because the best revenge isn’t petty — it’s graceful, glittery, and comes with a spreadsheet.