Conversation so far:
What was William Randolph Hearts first interested in?
William Randolph Hearst was particularly interested in the newly emerging technologies relating to aviation and had his first experience of flight in January 1910, in Los Angeles.
Why were John and Jacqueline Kennedy at one of William Randolph Hearst's homes?
According to Hearst Over Hollywood, John and Jacqueline Kennedy stayed at William Randolph Hearst's The Bevery House for part of their honeymoon.
Did William Randolph Hearst inherit from his father?
William Randolph Hearst inherited timber and mining interests and a 240,000 acres ranch at San Simeon, California, from his father.

Question: Did his mother take over the building project of one of his mansions?
Self-contained rewrite: Did William Randolph Hearst's mother take over the building project of one of his mansions?