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What is the first thing the Grangerfords do to or for Huck when he is welcomed inside their house?
The lady of the house takes pity on Huck's soaking wet form and gets him dry clothes and food.
Look him over to make sure he does not look like a Shepherdson.
Pry into his pockets looking for weapons.
Question Huck about his involvement with the Shepherdsons.
Technically nothing. They never let him into the main house; he is forced to sleep in the barn after being looked over.