A.P.
Hi M.,
My name is A.,if I were you I would check the exterior of your home and look for the tiniest of holes,even if you think nothing could fit thru they prolly could and if you find holes stuff them with steel wool, other things you can do is put moth balls around the outside of your house mice hate the smell and they won't come near them along with racoons, possums, skunks, and all kinds of pests and rodents. For in the house you can use peppermint oil, not the candy flavoring but the real kind you buy at the health food store and saturate a cotton ball with them, they don't like the smell of that either. Good luck.
A.