Transfer of interest in "heir property"

my cousins and I were heirs to farm land in South Carolina. At the death of our grandparents, who both died intestate, my aunt who was the representative, granted or arranged for her child and one uncle to through a deed of the heirs to get their share. The rest of the heirs or their children have not received their part, hence, we have what is known as "heir property". A developer wants the land. They have lived there all their lives and don't want to move. I resently sold my interest to this developer. I have been threatened with lawsuit and downright mayhem by relatives. As a proven heir, am I allowed to sell my interest and not the land proper to whomever will buy that interest? since I had no clear deed what can legally happen to me. Nobody made me an offer only threats.