Your mother-in-law closes her eyes, as if trying to think back, and says:
"This was before either of you two were born, Erica and Faye. One Saturday I was going to go shopping. I made up a list on the computer, and then told your father I was going for a quick shopping trip, and then I got in the car. But after I opened the garage door, I realized that I had forgotten to print out my shopping list! So I shut the garage door, came back in the house, took off my shoes as usual, and then walked quickly and quietly back to the den where we kept the computer..."