The Hatfields, e.g. is a reference to the Hatfield-McCoy feud, a long-standing dispute between two families in the Appalachian Mountains of West Virginia and Kentucky in the late 19th century. The term is used to refer to any two groups or families that are in a long-standing feud. The crossword solution for this term is CLAN, which is an appropriate term to describe the Hatfields and McCoys as they were both large extended families.