Ellen Hamlin
Ellen Vesta Emery Hamlin was the second wife of Vice President Hannibal Hamlin who served in the first term of the administration of President Abraham Lincoln. They were married a year after the death of his first wife Sarah Jane Emery in 1855 who was also her halfsister. She had two children with Hannibal Hamlin Hannibal Emery, who later became the attorney general of Maine, and Frank. Hamlin also had four children from his first marriage George Hamlin, Charles Hamlin, Cyrus Hamlin, and Sarah Hamlin Batchelder.
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Source: Wikipedia