My mom, brother, and sister-in-law turned my home into a nightmare after moving in—and I tolerated it for months before finally standing my ground.

For three nights, the beat-up grey sedan parked across from my driveway at exactly 9:00 p.m. Windows blocked with sunshades. Engine off. In my neighborhood, that usually means someone is casing houses to rob them.

I’m seventy-two. I live alone, but I’m not helpless.

On the fourth night, the temperature dropped to near freezing. I grabbed my heavy flashlight and …