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How is Grendel's ancestry significant to the poem?
He is related to Cain and therefore naturally evil.
He comes from a long line of monsters--it's in his blood.
God gave Cain "the mark of Cain" so that no one would harm him. Grendel might have this, too.
Grendel is from hell so he is naturally evil.
Like Cain, Grendel is a miserable exile, which explains his hatred of those having fun together.