Squatter's Rights?

Question Details: I am a landlord; my renters let their daughter ocupy their RV in the front yard of the rental for a period of 90 days agreed upon by myself and the renters. The 90 days is well past and the daughter refuses (and is apparently economically unable) to move. I do not have any agreement with the daughter only the renters; I have sent a Letter of Demand asking that the daughter vacate the RV or I will start eviction proceedings on them. I really do not want to lose what are good renters, and they don't want their daughter staying there either, but she will not move...claiming squatters rights.

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