Check the contract that you parents have signed - in order for it to be legally binding it should be in both English and Spanish. It should also be a "Vivienda" type contract, which denotes that it is for the long term, as opposed to a short term Holiday let.
Once you have a copy of the contract you should take it to the nearest visit the nearest municipal consumers' office (OMIC - Oficina Municipal de Información del Consumidor), who should be able to advise you exactly where your parents stand legally. There are a number of circumstances when the owners can legally ask your parents to leave, so it really depends on the official reasons that they have stated in writing.
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