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MacArthur's parents were Captain Arthur MacArthur III and Mary McCalla MacArthur. Through his mother, he was a grandson of Bowman H. McCalla, great-grandson of Colonel Horace Binney Sargent, and great-great-grandson of Lucius Manlius Sargent. Named for his uncle, General Douglas MacArthur, he was born in Bryn Mawr, Pennsylvania in 1909.