We have been living in heir property for 3 years during probate proceedings. We were called by a third party and said we have to move within 2 weeks.

Not knowing who the third party is makes answering your question difficult.  It could be that the third party is the administrator of the estate.  If so, he has a right to bring an eviction proceeding. If it is the administrator of the estate, he is not a third party.  He actually is the only person with authority to deal with the property. Presumably you have been paying rent to someone during the time that you have lived in the property? In any eviction proceeding, the party bringing the claim will have to prove that he has the legal right to dispossess you.