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"Yes, he's got a father, but you can't never find him these days. He used to lay drunk with the hogs in the tanyard, but he hain't been seen in these parts for a year or more." (2.16)
Pap’s alcoholism is no secret to the community. It explains others’ willingness and insistence at helping Huck all the time.
He took it and bit it to see if it was good, and then he said he was going down town to get some whisky; said he hadn't had a drink all day. When he had got out on the shed he put his head in again, and cussed me for putting on frills and trying to be better than him; and when I reckoned he was gone he come back and put his head in again, and told me to mind about that school, because he was going to lay for me and lick me if I didn't drop that. (5.28)
Violence is clearly associated with alcoholism in Adventures of Huckleberry Finn.
Next day he was drunk, and he went to Judge Thatcher's and bullyragged him, and tried to make him give up the money; but he couldn't, and then he swore he'd make the law force him. (5.29)
Pap is belligerent and insistent when drunk.