Question: Who is the paternal grandfather of William Backhouse Astor Sr.?
Sentence (from "John Jacob Astor"): John Jacob Astor (born Johann Jakob Astor; July 17, 1763 – March 29, 1848) was a German–American businessman, merchant, real estate mogul and investor who mainly made his fortune in fur trade and by investing in real estate in or around New York City.
Relevant evidence: Yes