Not sure about Cali law, but as an owner in possession you have many rights and they have few. This is a very different situation than if you owned but rented the whole place out. I don't think standard renter protections apply to them, but check your local county code and/or lawyer.
My guess is that without paying rent they have at best 1 month to stay before you can put all their stuff outside the house and change the locks.
My guess is that without paying rent they have at best 1 month to stay before you can put all their stuff outside the house and change the locks.