LONDON (AFP) - Britain's royal family forced the late Princess Diana to blood test her younger son, Prince Harry, to prove he was not the offspring of an affair with an army officer, according to a newspaper report. Diana, who died in 1997, did not tell Harry why his blood was being taken, the Sun newspaper said in extracts from a book by Simone Simmons, an "energy healer" billed as a former close friend and confidante of the princess. Senior royals, notably Queen Elizabeth's husband Prince Philip, feared that their son, Prince Charles, who was married to Diana, might not...