Can a cop come into your home if your home is on someone's property and they have a warrant for that person and his property?

More information is needed to evaluate. has a great "find a lawyer" tool to find a local civil rights lawyer who can evaluate it.

I'm assuming that a search of your camper was conducted curing a search of your cousin's property with a search warrant. If that assumption is correct and if items were found and seized during the search of your property then you need to have the warrant examined by a qualified criminal defense attorney to obtain an opinion about the legality of the search of your camper. The search authority granted to police upon issuance of a search warrant will be apparent from a review of that document and the supporting probable cause set forth.