Rockefeller is a grandson of Standard Oil co-founder, William Avery Rockefeller, Jr. (1841—1922) and businessman James Jewett Stillman (1850—1918).
William Jr and Almira's second son William Goodsell Rockefeller married Sarah Elizabeth "Elsie" Stillman, the elder daughter of National City Bank president James Jewett Stillman and Sarah Elizabeth Stillman, and they were the parents of James Stillman Rockefeller.
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