For two years, my mother-in-law acted like my home belonged to her son. Then I finally asked my husband to tell her the truth. The deed said everything.

By the time Serena Miller realized the upstairs air conditioning zone had been shut off again, the temperature inside her bedroom office had climbed high enough that the back of her blouse was damp beneath her shoulders. Outside, a brutal July afternoon pressed against Savannah, Georgia, with the thermometer approaching ninety-five degrees, while sunlight poured through the tall windows of the house her father had left her six years earlier.

Serena was preparing for an important video meeting that had already been rescheduled once. Her laptop sat open beside organized notes, a glass of water, and the wireless headset she had tested fifteen minutes earlier. She touched the thermostat application on her phone and saw that the master bedroom zone had been disabled manually again. Serena walked into the hallway and found Beatrice Vance, her mother-in-law, standing beside the wall-mounted thermostat with a satisfied expression.

“Did you turn off the upstairs cooling?” Serena asked, stopping a few feet away.

Beatrice folded her arms across her chest calmly. “There is absolutely no reason to cool half the house because you want to sit upstairs behind a closed door all afternoon.”

“I told you this morning that I had an important meeting and needed the room quiet,” Serena said, trying to keep her voice steady.

“You are sitting in your bedroom with a computer, Serena,” Beatrice replied with a dismissive wave. “Please stop acting as though you are running the Pentagon.”

Five years of marriage had taught Serena that Beatrice rarely needed evidence before deciding whose needs mattered. Two years earlier, Beatrice had asked to stay temporarily after the lease on her apartment ended, and Lucas, Serena’s husband, promised it would last several weeks. Several weeks became several months, and several months eventually became two full years.

During that time, Beatrice gradually stopped behaving like a guest and started behaving like the person who had inherited the house herself. She reorganized Serena’s kitchen without asking, moved family photographs because she disliked their arrangement, invited relatives for weekend dinners without checking schedules, and regularly described the property as Lucas’s house when speaking to neighbors. Serena had corrected her twice, but Beatrice had simply laughed both times.

Serena took out her phone and called Lucas, who answered after four rings. “Hey, I am about to walk into something,” Lucas said quickly. “Can this wait?”

“Your mother turned off the air conditioning upstairs after I specifically told both of you that I needed the room for a meeting,” Serena said into the receiver.

There was a familiar pause on the line, which was not surprise, but calculation, as Lucas decided how little effort might make the problem disappear. “Just turn it back on, Serena,” he said softly.