If the boy's blood related is the "uncle's" previous wife, the marriage between the former wife and the boy is called an avunculate marriage, and such a marriage is incestuous and void in every U.S. state and many other nations. In some countries, such as India, public opinion may not have caught up with modern concepts of divorce, so a person could find themselves married to their cousin if they were still living with their first wife. The practice of marrying within your own family is very common in Asia, especially in China where many families have one son who will inherit all their wealth, so people there often look outside their family for spouses.
In ancient Israel, the law stated that one must not marry one's brother's widow or sister-in-law (Leviticus 19:17). Although Israel was a patriarchal society, with the husband being the head of the household, this commandment shows that God considers any relationship between two family members, no matter how distant, to be significant and lasting. In the New Testament, Paul explains that this commandment applies to husbands as well as wives.
It would be unlawful for such persons to marry, and even if they went through a wedding ceremony, their union would be null and invalid. An uncle and niece are called "second-degree relatives" since they share 25% of their DNA. It would be incestuous for them to marry.
In ancient Rome, a person with access to the highest courts could declare any marriage void. This privilege was given to priests of Jupiter, who could annul marriages that were considered illegal or immoral. Annulled marriages were not repeated; the parties involved returned to where they lived before they married, and any property they had jointly acquired was not forfeited. The only way out of an annulled marriage was divorce.
In the United States, the law governing marriage and divorce is state law. Some states allow anyone to file for an annulment, while others require a reason be given for the request. State laws may also differ on how long an annulment can be filed after the marriage took place. If one spouse later dies, the other may be able to use the annulment as a defense in a legal action regarding ownership of any property that was acquired during the marriage.
People get married for many different reasons. In some cases, it may be because they believe the union has spiritual significance. For others, it may be because they want families together, or because they feel like they have no choice but to marry this person.
Any union between an uncle or aunt and a niece or nephew. It might apply to a marriage between biological relatives or those who are linked by marriage. With the exception of Australia, it is officially prohibited in the majority of English-speaking nations. In Canada, India, Israel, New Zealand, and most of Africa, such marriages are illegal.
In England and Wales, where same-sex marriage was introduced in March 2014, there is no law against it but neither is it legal for two men or two women to marry. The government's view is that LGBT people should be able to decide for themselves what they want to do with their lives and love ones, and that they should not be prevented from doing so through fear of prosecution or social disapproval.
In America, same-sex couples can get married in states where it is allowed, but cannot be married nationally. Same-sex couples are allowed to adopt in almost all states, but cannot be married nationally. There are some exceptions: Native Americans, whose tribes have not banned them, can marry anywhere else in the country. Also, individuals who work for a corporation that has offices in several states can marry as long as one of those states allows it. Finally, some states allow gay couples to wed without having to show evidence of being in a relationship; others require them to be living together before getting hitched.