Born: May 21, 1870
Died: November 30, 1922
Married: Florence Lincoln
Children: William Rockefeller III(?), Frederic L. Rockefeller, Elsie MacMillan (d.1982)
William Avery Rockefeller II was the son of William G. Rockefeller from whom he inherited the Bay Pond estate. He left the estate to his three children, who sold an easement on 21,000 acres to the Adirondack Nature Conservancy in 1979, retaining 12 development rights in the immediate region of the pond.
Source: Barbara McMartin, The Privately Owned Adirondacks, Lake View Press, Canada Lake, NY, 2004, pp. 247-8