I was sitting on the squeaky wooden steps of a rented beach house at four in the morning, staring at a thin purple yoga mat through the screen door. My 68-year-old mother, Ruth, was asleep on that mat in the middle of the hallway.

To understand why this hurt so much, you have to know a little about Ruth. She is the kind of mother who never asks for a single thing. Back in the day, she raised five of us in a tiny house with only two bedrooms. She always slept on the lumpy living room sofa so we could have the mattresses. She is tiny, mind you, barely five feet tall, but she has a heart bigger than the whole state of Alabama.

So when my daughter-in-law, Brittany, planned this big family trip to Gulf Shores, I was thrilled. She kept calling it the trip that would bring us all together. She collected three hundred and eighty dollars from each of our households to pay for the rental. I paid my share early, happy to have the whole family under one roof.

We drove nine long hours to get there. The moment we walked inside, the chaos started. The kids ran wild, grabbing the bunk beds. My brother and his wife claimed the first queen room. Brittany and her husband, my son Marcus, immediately ran upstairs to unpack their bags.

Mom was left standing in the kitchen, holding her little blue overnight suitcase. Her knees have been bad for years now, and she can barely bend them in the mornings. She looked around, waiting to see where she should go.

That was when Brittany came downstairs, smiling her big, bright social-media smile. She had that purple yoga mat under her arm. She unrolled it right there in the hallway, right next to the linen closet and the main bathroom door.

“Oh, Ruthie, I figured you would be comfy right here,” Brittany said. She laughed, a quick, airy sound. “You are so small anyway. You barely take up any space.”

Mom just looked at that thin piece of plastic on the hardwood floor. She didn’t complain. She never does.

“This is just fine, honey,” Mom said. She gave Brittany a little nod. “I sleep light anyway.”

That line nearly broke me. I watched my own mother lie down on that hard floor with a rolled-up beach towel for a pillow. Her hands were shaking when she pulled her thin sweater over her shoulders. She was trying so hard to pretend she was fine so she wouldn’t ruin the trip for the rest of us.

I couldn’t sleep a wink. The house was full of the sound of people snoring and the hum of the air conditioner. Every time one of the teenagers went to use the bathroom, they had to step right over my mother’s legs.