Those folks put the quits to fuedin long time back. I met a lass at a meeting in Logan WV a few years back who was named Hatfield. That uz her married name; she was born a McCoy. Said she knew half dozen or so other couples in the hills in the area who were Hatfield-McCoy pairings.
My dad grew-up in Logan. When I was little my grandmother told me that the Hatfields "are kin". Must be pretty distant though because I haven't yet found them in the family tree.