I do not know ? But I am sure that all Zumwalts are cousins. My mother-in-law's grandmother was Cynthia Zumwalt who m James Walker Harpole and they came to Oregon in the 1850ies. He had crossed the plains with his first wife Matilda who died... He went back living his children in Oregon and came with cattle and married Cynthia.. The wives were cousins.