My sister booked a ballroom for her son’s birthday and told everyone I’d be paying for it—even though I had never agreed. When I refused, my mother threatened to cut me off. In that moment, I realized they didn’t appreciate everything I had already done or paid for; they simply expected more.

The ballroom was already booked, the cake was ordered, and my sister had told everyone that I was paying for her son’s birthday party. When I said, “Not one dollar,”…