I have a homosexual question and incest question?

[Dystopia]

I have a question for you, is it true that the US establishes sentences that can go up to 25 years (in some cases even life in jail) for incestuous relationships? If this is true, it sounds stupid.

These kind of laws are regulated by each state. There is no federal regulation against incest. So it depends on where you live. I honestly don't know a lot about this as I've never taken much interest in the topic. But here is some copypasta to help you get started on your research.

"In the U.S., incest is regulated by state, not federal law, and every state has one or more laws banning this problematic behavior. And while states sometimes vary in defining the outer boundaries of who is considered “family” and the exact behaviors that are off-limits, the underlying goals or policy considerations remain consistent among states."
"Penalties for an incest conviction vary according to state law, but may include separation of family members (if a child is involved, the child may be placed in foster or other care), or a jail or prison term of several months to many years."
http://www.nolo.com/legal-encyclopedia/i...arges.html

Quoting wikipedia:
"5 years imprisonment in Hawaii, Florida
10 years imprisonment in North Dakota, South Dakota, Wisconsin, and Minnesota
14 years imprisonment in California, Oregon, Washington, Alaska and Idaho
15 years imprisonment in Connecticut, Maryland, Delaware, Virginia and West Virginia
20 years imprisonment in Massachusetts, New York, New Hampshire, Maine, Pennsylvania, and Vermont
25 years imprisonment in Kansas, Nebraska, Arkansas, Missouri, Oklahoma, Texas, Arizona, New Mexico, Nevada, Colorado, Wyoming, Iowa, Illinois, Indiana and Kentucky
Life imprisonment in Georgia,[46] Alabama, Mississippi, Louisiana, North Carolina, South Carolina and Tennessee.
Three convictions or more of incest also require the offenders to register as "Sex Offenders"[citation needed]

In all states, close blood-relatives that fall under the incest statutes include:

Father
Mother
Grandfather
Grandmother
Brother
Sister
Aunt
Uncle
Niece
Nephew"

At least where I live incest is legal, even children can be registered in both parents' names. But marriage is not allowed, it's classified by the civil code as an impossibility for marrying, the others being minority and a serious mental or psychological issue.