It's a good question. Initially, I thought it was still a comma splice, but now I'll have to consult my reference books or wait for a good reply.
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abc4efgyour father is smart and your mother is smart, therefore you are smart.This is a comma splice.
Grammar GeekThe original is fine.By 'the original' you mean 'Your father is smart, your mother is smart, and therefore you are smart.', right?
Grammar GeekThe original is fine.abc4efgyour father is smart and your mother is smart, therefore you are smart.This is a comma splice.