Thomas Jefferson had a secret family. He decried interracial relationships but was having one of his own the whole time with his slave, Sally Hemmings, with whom he had six children. He never formally acknowledged their existence and carried on as normal with his white family.
For example:
Ranking the most philanthropic people across the country, Forbes singled out the Gates couple, who donated $2.65 billion last year toward fighting disease and reforming education, among other initiatives. One notable gift cited by Forbes was $50 million dollars given by the pair to the International Aids Vaccine Initiative. Over their lifetime, the two have given out $30.2 billion, about 37 percent of their net worth.
http://www.nationalreview.com/article/366317/remembering-mandela-without-rose-co
lored-glasses-andrew-c-mccarthy#!