..and as far as the crown is concerned the "top job as I like to call it" can go to a female if she doesn't have any brothers or if she has outlived them - hence Mary succeeded Edward VI and Elizabeth succeeded Mary. The best example, of course, is that of our own dear Queen who succeeded her father. If strict promogeniture had applied at that time then Henry, Duke of Gloucester, George V's third son, would have succeeded his older brother, George VI and his second son, Richard, would now be king.