At age seven , Henry was adopted by uncle James Buchanan and raised as his ward .
Henry was the son of Harriet Buchanan ( 1802 - 1840 ) and the Reverend Robert Henry .
At age seven , son was adopted by uncle James Buchanan and raised as his ward .
Henry was the son of Harriet Buchanan ( 1802 - 1840 ) and the Reverend Robert Henry .