towerwatchman : No it [Granville Sharp's rule] does not apply [to Proverbs 24:21 LXX].
Proverbs 24:21 LXX reads "Fear [the] God (ton theon), O son (uie), and (kai) king (basilea), and do not disobey either one of them (methetero auton)."
So, once again, Granville Sharp's rule is :
When the copulative kai connects two nouns of the same case [God and king are the two nouns of the same case] ... if the article ho, or any of its cases, precedes the first of the said nouns [the first of the said nouns is "God" (ho theos) and, as can be seen, it is preceded by ho], and is not repeated before the second noun [the second noun is "king" (basilea) and has no preceding ho], the latter [king] always relates to the same person that is expressed or described by the first noun [God]...except the nouns be proper names, or in the plural number.
If you cannot accept this is an exception to Granville Sharp's rule I have to conclude you are being willfully blind. I cannot express it any clearer.