@CelticMutt
While I do understand your point, I still disagree with the usage here. The way you use 'sire' is by adding possessive noun, such as "my sire" referring to "my father" or "his sire" referring to "his father". Or as a verb, such as 'sired', "He sired me" or "His actions sired the formation of the kingdom". 'Sire' without either refers specifically to a ruler figure, such as the king, the emperor or the prince of a principality.
It is the same reason why you don't call your school teacher or your superior officer 'Sir Roberts' even though you often call him with sir, such as "I fell asleep, sir". It is because "Sir *name*" is specifically reserved to refer to knights.