LOL!

I am afraid you are going to have to kill them unless you want your house over-ridden with mice.

I will tell you my little story. Way back when I was young and naieve my husband and I had our first little home. There was an old shed that came along with the house. While cleaning it we found a nest of baby mice. I said "oh don't kill them". BIG mistake. That winter they took up residence INSIDE my house. At night we would hear them running in the walls. I didn't sleep for a week. We did do the unthinkable and get the snap traps. I am sorry but I refuse to have rodents running in my house. At the time we did not have any cats. I don't think my cats have ever had the experience of playing with a live mouse and I hope they do not get to.

Maybe your kitties have exterminated them all.