Two classic American riddles (1854)

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Fred Shapiro should include a few riddles in his book of quotations...I just added "New York reload," "New York trigger," "New York stop," "New York breakfast," and a few more to my web page. Tell METRO it should be "blog of the day." C'mon, it's better than "Save Toby!"
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(AMERICAN PERIODICAL SERIES)
Merry's Monthly Chat with his Friends.; ENIGMA. CONUNDRUMS.
Merry's Museum and Parley's Magazine (1852-1857). Boston: Feb 1, 1854. p. 60 (5 pages)
Page two:
There was a man in prison, and another man came to visit him. The jailer asked him what relation he was to the prisoner. The vistor replied, "Brothers and sisters I have none, but that man's father is my father's son." What relation was the visitor to the prisoner?
>From your friend,
E. H. H.
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rry's Monthly Chat with his Friends.; ANSWERS TO CONUNDRUMS. ENIGMA. CONUNDRUM.
Merry's Museum and Parley's Magazine (1852-1857). Boston: Mar 1, 1854. p. 94 (4 pages) :
Page four:
Monroe, CONN., Feb. 9th, 1854.
MR. MERRY:--I thought I would write you a letter, and give you the answer to the puzzle in the last number--Brothers and sisters I have none, but this man's father is my father's son. The visitor was the prisoner's son. THe answer to the enigma is the letter E.
Yours, truly,
WILLIE CLARKE.
(...)
MR. MERRY:--What animal is it that first goes on four legs, then on two, then on three?
MILO EMERY.
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(Man--ed.)