John Davison Rockefeller III (March 21, 1906 July 10, 1978) was a philanthropist and third-generation member of the prominent Rockefeller family. He was the eldest son of philanthropists John D. Rockefeller Jr. and Abby Aldrich Rockefeller. His siblings were Abby, Nelson, Laurance, Winthrop, and David.

Can we draw the following conclusion?
John Davison Rockefeller III had four sisters.
No