Drake is a Blacksmith

Interesting theory, but I would say that it runs deeper than that.
I don't believe that George even hates Drake per se.
(Even though I don't get why Drake had to do that stupid thing with the frogs.)
But he does hate Drake's brother-in-law Ross and wanted to marry Morwenna off to somebody "better".
Which is why he did everything he could to destroy Drake's and Morwenna's happiness.