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.

Choose your answer: based on the paragraph above can we conclude that "John Rockefeller had six siblings"?

Possible answers: [i] Yes. [ii] It's impossible to say. [iii] No.
I think the answer is
[iii]