if they are not hurting your house then just leave them. they are doing you no harm & that is their home just as much as yours.
If they are hurting your house try building a space for them to...
It's going to have to come out at some time and when it does you should kill it or trap it. I prefer the first option because it will be a problem to someone else if it is relocated or the city you...
I would get a big dog -- one that likes to hunt and chase. Maybe you could borrow one. I would avoid having the dog backing the fisher cat into a corner, but if you keep the dog on a leash or rope...