If you'll excuse a minor quibble, I'm not sure about Peter's eldest son's title - I can't see any reason why he wouldn't have inherited the title of 'Duke of Denver'. AFIAK titles of the type 'Duke [surname]' aren't possible, and theres no reason why Bredon shouldn't have become Duke of Denver. (Cf the example here, from the Cavendish family: http://www.chinet.com/~laura/html/titles03.html )
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If you'll excuse a minor quibble, I'm not sure about Peter's eldest son's title - I can't see any reason why he wouldn't have inherited the title of 'Duke of Denver'. AFIAK titles of the type 'Duke [surname]' aren't possible, and theres no reason why Bredon shouldn't have become Duke of Denver. (Cf the example here, from the Cavendish family: http://www.chinet.com/~laura/html/titles03.html )