question: Who is Mamie Lincoln Isham's mother?
context: [["Verona Barnes", ["Verona Barnes( born December 29, 1946) is an American actress who appeared in multiple New York City theater plays.", "She is the stepmother of actress Rachel True.", "Her roles include Mrs. Harris and the Street Person in\" All God's Chillun Got Wings,\" as well as Jack's friend in\" The Great White Hope\"."]], ["Susan Moody", ["Susan Moody( born 1940 in Oxford) is the principal\" nom de plume\" of Susan Elizabeth Horwood, an English novelist best known for her suspense novels.", "After marrying Professor John Dalgleish Donaldson in 2001, she became the stepmother of his four children, including Crown Princess Mary of Denmark."]], ["Dorothy Granger", ["Dorothy Karolyn Granger( November 21, 1911 \u2013 January 4, 1995) was an American actress best known for her roles in short subject comedies in Hollywood.", "She was also the stepmother of film maker and former record producer Anthony J. Hilder."]], ["Henriette Feuerbach", ["Henriette Feuerbach( 13 August 1812 \u2013 5 August 1892) was a German author and arts patron.", "She was the wife of Joseph Anselm Feuerbach and the stepmother of painter Anselm Feuerbach, whom she supported in his art."]], ["Irene Baker", ["Edith Irene Bailey Baker( November 17, 1901 \u2013 April 2, 1994) was an American politician and a United States Representative from Tennessee.", "She was the widow of Howard Baker Sr. and the stepmother of Howard Baker Jr."]], ["Robert Todd Lincoln", ["Robert Todd Lincoln (August 1, 1843 \u2013 July 26, 1926) was an American politician, lawyer, and businessman.", "The first son of President Abraham Lincoln and Mary Todd Lincoln, Robert Lincoln was born in Springfield, Illinois, and graduated from Harvard College before serving on the staff of Ulysses S. Grant as a captain in the Union Army in the closing days of the American Civil War.", "After the war, Lincoln married Mary Eunice Harlan, and they had three children together, two of whom survived to adulthood.", "Following completion of law school in Chicago, he built a successful law practice, and became wealthy representing corporate clients.", "Active in Republican politics, and a tangible symbol of his father's legacy, Lincoln was often spoken of as a possible candidate for office, including the presidency, but never took steps to mount a campaign.", "The one office to which he was elected was town supervisor of South Chicago, which he held from 1876 to 1877; the town later became part of the city of Chicago.", "Lincoln accepted appointments as secretary of war in the administration of James A. Garfield, continuing under Chester A. Arthur, and as United States Ambassador to the United Kingdom (with the role then titled as \"minister\") in the Benjamin Harrison administration.", "Lincoln served as general counsel of the Pullman Palace Car Company, and after founder George Pullman died in 1897, Lincoln became the company's president.", "After retiring from this position in 1911, Lincoln served as chairman of the board until 1922.", "In Lincoln's later years he resided at homes in Washington, D.C. and Manchester, Vermont; the Manchester home, Hildene, was added to the National Register of Historic Places in 1977.", "In 1922, he took part in the dedication ceremonies for the Lincoln Memorial.", "Lincoln died at Hildene on July 26, 1926, six days before his 83rd birthday, and was buried at Arlington National Cemetery."]], ["May Green Hinckley", ["May Green Hinckley( May 1, 1881 \u2013 May 2, 1943) was the third general president of the Primary of The Church of Jesus Christ of Latter- day Saints( LDS Church) from 1940 until her death.", "She was the stepmother of Gordon B. Hinckley, fifteenth president of the LDS Church."]], ["Jane Wigham", ["Jane Wigham( n\u00e9e Smeal; 1801\u20131888) was a leading Scottish abolitionist.", "She was the stepmother of Eliza Wigham and the second wife of John Wigham."]], ["Livia Ocellina", ["Livia Ocellina was the second wife of Gaius Sulpicius Galba and the stepmother of the Roman Emperor Galba.", "According to Suetonius she was: Galba was raised by her and took on the name Lucius Livius Ocella( rather than his birth name of Servius Sulpicius Galba) during the period prior to his assumption of the purple."]], ["Mamie Lincoln Isham", ["Mary Todd \"Mamie\" Lincoln Isham (October 15, 1869 \u2013 November 21, 1938) was a granddaughter of Abraham Lincoln, the first daughter of Robert Todd Lincoln and the mother of Lincoln Isham."]]]
supporting_facts: [["Mamie Lincoln Isham", 0], ["Robert Todd Lincoln", 2]]
evidences: [["Mary Todd \"Mamie\" Lincoln Isham", "father", "Robert Todd Lincoln"], ["Robert Todd Lincoln", "spouse", "Mary Eunice Harlan"]]
answer: Mary Eunice Harlan