If a person that owns a house goes to jail, how does he get his girlfriend out of the house?

He will have to bring an eviction action.  The sale of the contents might constitute a criminal act, so a police report could be filed.  However, many times these disputes get bogged down in questions of facts: who actually owned the contents, what agreements did they have, did she contribute to occupancy costs or pay rent, etc. This is specific to Florida law and does not constitute legal advice as the facts presented are anonymous and incomplete. This is intended for general education only and does not create an attorney-client relationship. This should not be relied on and you must seek your own attorney client relationship.