I’d been married to Richard for three years, and our life was happy except for one constant problem: his mother, Monica. She was always sweet to my face, but behind my back she criticized me, questioned our marriage, and even suggested Richard should have married someone else. Her worst habit, however, was invading our privacy. During a dinner party, I caught her wandering through our bedroom and opening our drawers. She claimed she had gotten confused, but it wasn’t the first time she had snooped, so Richard and I decided to put a lock on the bedroom door.

Before we installed it, I had an idea. I covered the doorknob with glitter, figuring that if Monica tried to enter again, we would finally have proof. The next day, we found her standing outside our bedroom covered in golden glitter. Furious, she complained about her ruined sweater and accused me of deliberately humiliating her. I calmly asked why she had been trying to enter our bedroom again, but she refused to answer and instead focused on what I had done to her.

What hurt most was Richard’s reaction. Instead of simply supporting our shared boundary, he criticized me for embarrassing his mother and said I had gone too far. I told him the glitter wasn’t the real issue—Monica had repeatedly crossed a line, and now we finally had proof. As I looked at my husband, though, I realized something more important: the real problem wasn’t just having a mother-in-law who refused to respect our privacy. It was whether my husband was willing to stand beside me when she did.