Where were they born? Who among them were born outside the USA? What did they do? Their work, their marriages, their trials, their child rearing philosophies. Which parents attended the inaugurations of their sons? Who among them are still living? Individual biographies of each of the parents of the presidents.
Presidents and their absent fathers: A surprising lesson from history.
Obama and his grandmother:
A reprise of Lincoln.
Only the second president and first lady to also be the parents of a president. George and Barbara Bush.
George H. W. Bush facts