Rockefeller's son-in-law runs $13,000 into $218,000,000, Sec. inquiry told. Washington, D.C., Dec. 17. How he won control of a $218,000,000 investment concern by putting up $13,000 in cash and 6,500 shares of stock in an inactive insurance was told the Securities and Exchange Commision today by David Miltion, son-in- law of John D. Rockefeller. Milton is shown with David Schenker, left, Counsel for the Sec. who is conducting the investment trust inquiry