David Rockefeller Jr. (born July 24, 1941) is an American sailor, philanthropist, and an active participant in nonprofit and environmental areas. He is the eldest son of David Rockefeller and Margaret "Peggy" McGrath. David Jr is a leading fourth-generation member (known as "the Cousins") of the prominent Rockefeller family, serving on many boards of the family's institutions. His siblings are: Abby, Richard, Peggy, Neva, and Eileen.