What is the Mississippi Law and Federal Law against incest?
<p>What is incest legally and what punishment applies?</p>

<p>The Mississippi <a href="https://codes.findlaw.com/ms/title-97-crimes/ms-code-sect-97-29-5.html" rel="nofollow noreferrer">general prohibition</a> against incest is that</p>

<blockquote>
  <p>Persons being within the degrees within which marriages are prohibited
  by law to be incestuous and void, or persons who are prohibited from
  marrying by reason of blood and between whom marriage is declared to
  be unlawful and void, who shall cohabit, or live together as husband
  and wife, or be guilty of a single act of adultery or fornication,
  upon conviction, shall be punished by imprisonment in the penitentiary
  for a term not exceeding ten (10) years.</p>
</blockquote>

<p>The degree of relationship declared to prohibit marriage <a href="https://codes.findlaw.com/ms/title-93-domestic-relations/ms-code-sect-93-1-1.html" rel="nofollow noreferrer">is defined as</a></p>

<blockquote>
  <p>(1) The son shall not marry his grandmother, his mother, or his
  stepmother;  the brother his sister;  the father his daughter, or his
  legally adopted daughter, or his grand-daughter;  the son shall not
  marry the daughter of his father begotten of his stepmother, or his
  aunt, being his father's or mother's sister, nor shall the children of
  brother or sister, or brothers and sisters intermarry being first
  cousins by blood.  The father shall not marry his son's widow;  a man
  shall not marry his wife's daughter, or his wife's daughter's
  daughter, or his wife's son's daughter, or the daughter of his brother
  or sister;  and the like prohibition shall extend to females in the
  same degrees.  All marriages prohibited by this subsection are
  incestuous and void.</p>
</blockquote>

<p>In the US, incest laws are at the state level, not the federal level.</p>

united-states criminal-law family-law mississippi