In The Adventures of Huckleberry Finn, when Huck visits Mrs. Loftus disguised as a girl, what does he do that makes her discover his disguise?

 He forgets the name he gave himself as a girl.

Explanation:

He starts by saying Mary Williams, realizing his mistake he corrects himself to Sara Mary Williams.

the answer would be: it explains that at least one son must join the church

the expression ''as the tithe of his sons'' indicates how his father intended for at least one of his sons to serve the church. this phrase demonstrates that his father offered him as a last resort since none of his brothers chose to serve the church.

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