Question: When did John D. Spreckels's father die?
Sentence (from "John D. Spreckels"): John Diedrich Spreckels (August 16, 1853 – June 7, 1926), the son of German-American industrialist Claus Spreckels, founded a transportation and real estate empire in San Diego, California, in the late 19th and early 20th centuries.
Relevant evidence: Yes