[quote]You are the owner. If there is no lease, there is no proof that they can show a court to live there.

So, wait until they are not home. Go in and change the locks. If they break in, then they are now breaking and entering. [/quote]

If they are receiving mail at the residence then they are a legal tenant & you will have to evict them, lease or no lease. Welcome to my world of deadbeat tenants (whether you meant for them to be or not) that have more rights than the property owner who pays the taxes & mortgage.