Generation4b. Prince Henry, Duke of Gloucester (1900-1974) Son of King George V and Mary of Teck, he was younger brother to George VI. His first son, Prince William of Gloucester, died in an airplane crash at age 30, leaving no heirs. His only other child is Prince Richard, the current Duke of Gloucester. Prince Henry was Queen Elizabeth's uncle, and his descendants are in line of succession, on this board, #24-33.