I''ve got 35 acres and in the center not touching the road is a 5acre pice of land.Do we legal have to let the person who bought the five get to it?

Quite possibly. Under the doctrine of "easement by necessity," the owner of the landlocked parcel may have the right to cross your land if it is absolutely necessary to do so in order to access his land. See an attorney for further information based on a detailed review of your facts.