The sons of the Prince of Wales and the grandson of Queen Elizabeth II and Prince Philip, Duke of Edinburgh have grown up in the spotlight. Their mother, Princess Diana, died in a car accident in 1997. The eldest brother, William, is second in line to the throne of England. Prince Harry, the youngest, is third in line of succession. Watch SOAPnet's Relative Madness -- It's a Sibling Thing countdown this Thursday night to see if the princes top the list!