What is the quickest way to get rid of squatters that are living in an uninhabitable house?

Question Details:

In late 2009, I inherited a home that is inhabitable (no plumbing, infestation, mold etc.). A family member needed a place to stay for a few nights last December so I agreed to let him sleep there for a weekend. Nine months later, he is still refusing to leave the house and his girlfriend is also staying with him. Since they are refusing to leave, do they have rights? Do I have to legally evict them even though they were never tenants? Is there any easier way to get them out since the house is clearly uninhabitable? Also, once I do get them out, can I sell the house as is? Or do I first have to make it inhabitable? Will a health inspector come out?

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