My Greedy Son Made Me Ration Toilet Paper,So I Sold Everything

From the back cover

Harold Acevedo and his wife scrimped and saved for half their lives, and the one time they let themselves live a little, their son Phineas Cobb and his wife Bridget Sears were waiting at the door. The trip was their own money, Phineas shouted, but everything they had would be his eventually, so the more they spent now, the less there was for him. When demands to hand over the assets failed, the two moved in and began policing every cent: groceries capped at five dollars, no air conditioning in hundred-and-four-degree heat, two squares of toilet paper per bathroom trip. To save a few dollars on medication, they put Harold in the ICU, clinging to life.

Harold and his wife refuse to surrender the house, the savings or the pension checks. Phineas and Bridget dress their demands up as family closeness and care in old age, but the couple see the truth: they are being watched, not looked after. So they make a quiet decision. They will spend every last dime themselves, and then drain every cent of their son's money too.