Set traps!
We had mice in the attic at the old house and didn’t know it till we sold it and they did the inspection. The exterminators used peanut butter for bait.
I know. I need to get traps that will not harm the cats. The bigger issue is, I have NO idea where or how they are getting into the house. There has to be something I can spread around the foundation of the house. Looks like I will be making a trip to “Save Big Money at MENARDS” hardware store.