Have you tried Acme Corporation? They usually sell great items for getting rid of vermin.
Last time I had mince I just used peanut butter in traps.
I'd personally rather have mice than a cat.
Now a dog trained to catch mice, that's what you need.
As lovely as the dog would be, a mouse catching dog would probably smash your house to pieces in the process. I've got the worlds clumsiest labradoodle!
This guy speaks the truth. I once caught three mice in three nights (one each night) on a single trap baited with a strawberry cream Quality Street.
I'm not sure mince and peanut butter in traps makes for a nice dinner.
Get two cats - never one.
If the dog doesn't like it - get rid.
If your brother doesn't like the idea of getting rid of the dog, then get rid of the brother.
I suspect that your mouse infestation is largely caused by food scraps and waste being left around. And a large part of that problem will be dog food. Get rid of the dog.... Oh! I already mentioned that
Try those ultrasonic things you plug into a socket in the wall?
Now a dog trained to catch mice, that's what you need.