My sister smiled while banning my eight-year-old son from his cousin’s birthday party because I refused to buy her a $70,000 SUV. By the next afternoon, her “perfect” celebration was collapsing vendor by vendor — balloons canceled, cake withheld, payments frozen. She thought using my child would force me back into line. She forgot one detail: the whole fantasy had been running on my money, and I had just shut it off.