Remembering History: Thomas "Tad" Lincoln poses on April 10, 1865 with his father President Lincoln in the Whitehouse. Tad outlived his father, but died of heart failure at the age of 18 on July 15, 1871.

Thomas "Tad" Lincoln poses on April 10, 1865 with his father President Lincoln in the Whitehouse. Tad outlived his father, but died of heart failure at the age of 18 on July 15, 1871.

Thomas "Tad" Lincoln poses on April 10, 1865 with his father President Lincoln in the Whitehouse. Tad outlived his father, but died of heart failure at the age of 18 on July 15, 1871.