Kara Sears
Marrying one's uncle-in-law is a complex topic, as it depends on the specific relationships involved. In casual conversation, the spouses of a person's parents' siblings are often referred to as uncles and aunts. However, in genealogy, an uncle-in-law is typically defined as one's spouse's uncle. Marriage laws vary across different countries and states, further complicating the matter. While some countries prohibit marriages between uncles and nieces, others permit such unions, especially if they are not biologically related. For example, in the United States, only Minnesota and Colorado allow marriages between uncles and nieces, and even then, only if it aligns with the established customs of the original tribes of Australia.
| Characteristics | Values |
|---|---|
| Marriage between uncle and niece allowed in the US | Only in Minnesota and Colorado, and only if the marriage was established by the customs of the original tribes of Australia |
| Marriage between uncle and niece allowed in the UK | No, it is prohibited by law |
| Marriage between uncle and niece allowed in other countries | Yes, it was common in pre-modern societies, and is still practiced in some places |
| Genetic relationship between uncle and niece | They share approximately 25% of their genetic material |
| Genetic risk of uncle-niece marriage | A 1990 study in South India found that the incidence of malformations was slightly higher in uncle-niece progeny (9.34%) compared to first cousin progeny (6.18%) |
| Examples of historical avunculate marriages | Charles II of Spain, Antipater II and Mariamne III, Herod Antipas and Herodias, Leopold I and Margaret Theresa of Austria, Adolfo Frederick II and Princess Johanna of Saxe-Gotha, etc. |
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What You'll Learn
Marriage laws vary by state in the US
Marriage laws vary across different states in the US. Marriage, in general, is a matter of state law in the US and not federal. While the Supreme Court has held that states can regulate the institution of marriage, their power is limited in two ways. Firstly, in the case of a conflict between a federal law regulating interstate commerce and a state's marriage laws, federal law takes precedence. Secondly, federal law controls the states' regulation of marriage when it comes to matters within the scope of the Bill of Rights or any subsequent amendments. For example, in the case of Loving v. Virginia, the Supreme Court invalidated a Virginia statute that prohibited marriage between persons of different races, as it violated the equal-protection clause of the Fourteenth Amendment.
All states have incest prohibitions, which usually include brother-sister, father-daughter, and first cousins. Twenty-five states allow first cousins to marry, six states permit it under certain circumstances, and North Carolina allows it but prohibits double cousin marriages. Marrying one's uncle-in-law is prohibited for women, as is marrying one's uncle. However, avunculate marriages (between an uncle or aunt and their niece or nephew) have been common in some societies and are still practiced in some places. Only two states, Minnesota and Colorado, permit marriages between uncles and nieces, and that too only if it adheres to the established customs of the original tribes of Australia.
Other differences in marriage laws across states include waiting periods, which vary from two or three days in Maryland, Louisiana, and Texas to five days in Minnesota. Some states recommend premarital counseling, with Colorado being the only state to mandate it, while California and Arizona require it for minors seeking to marry. Oklahoma, Texas, and Tennessee will discount or waive the marriage license fee if the couple attends marriage counseling before the wedding. Additionally, each state has its laws regarding property division, child support, and spousal support.
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Marriage between uncles and nieces is prohibited in most countries
Marriage between a niece and her uncle is prohibited in most countries. In the United States, for example, such marriages are banned in all states except Minnesota and Colorado, and even in these two states, they are only permitted if the marriage is in accordance with the established customs of the original tribes of Australia.
In the United Kingdom, marriages between uncles and nieces have been prohibited for nearly 350 years, with the 1931 Marriage Act specifically removing the possibility of marrying one's aunt or uncle by removing aunt and uncle-in-law from the list of permitted marriages.
Historically, avunculate marriages (marriages between an uncle and niece, or an aunt and nephew) were common in some societies, such as Ancient Egypt, South India's Hindus, and the House of Habsburg. Notable examples include Charles II of Spain, whose parents were uncle and niece, and Leopold I, Holy Roman Emperor, who married his niece, Margaret Theresa of Austria.
However, in modern times, avunculate marriages are prohibited by law in many places due to the close genetic relationship between the individuals involved. On average, an uncle and niece are expected to share approximately 25% of their genetic material, which can lead to an increased risk of malformations in their offspring. A 1990 study in South India found that the incidence of malformations was slightly higher in uncle-niece progeny (9.34%) compared to first cousin progeny (6.18%).
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Avunculate marriages were common in some pre-modern societies
Avunculate marriages, or marriages between an uncle and niece or nephew, were common in some pre-modern societies. The term "avunculate" comes from the Latin word "avunculus," meaning "uncle." Avunculate marriages were prominent in the House of Habsburg, with historical figures such as Charles II of Spain being the son of an uncle-niece marriage. Avunculate marriages were also common among South India's Hindus and are still practiced today, primarily in rural areas and small to medium-sized cities. In these cultures, it is customary for the eldest daughter to marry her youngest maternal uncle, and this tradition is often featured in South Indian movies.
Avunculate marriages were also present in ancient Egypt among royalty and have been documented in various historical figures throughout history, including Herod the Great, Byzantine Emperor Heraclius, and Leopold I, Holy Roman Emperor. In some societies, avunculate marriages are still permitted by law, including in Denmark, Germany, Switzerland, Austria, and several other countries. However, in other societies, avunculate marriages are prohibited and considered incestuous.
The anthropological term "avunculocal residence" refers to a social institution where boys leave their natal homes during adolescence and join the household of one of their mother's brothers. This practice has been identified in about 4% of the world's societies and is often associated with matrilineal descent. In these societies, the maternal uncle typically has a measure of authority over his nephews and sometimes nieces, along with specific responsibilities in their upbringing and marriage. The children, in turn, often enjoy special rights to their uncle's property and may take precedence in inheritance.
While avunculate marriages were common in some pre-modern societies, they are now far less common and are prohibited in many countries. In the United States, for example, avunculate marriages are only permitted in two states under specific circumstances. Overall, while avunculate marriages may have been more socially acceptable in certain historical contexts, they are now largely considered taboo in most parts of the world.
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Marrying your uncle-in-law is different from marrying your uncle
Marrying one's uncle-in-law is different from marrying one's uncle. An uncle is defined as a parent's sibling or, in a genealogical context, a parent's sibling related by blood. An uncle-in-law, on the other hand, is the husband of one's aunt or the uncle of one's spouse. In casual conversation, one might refer to their mother's sister's husband as their "uncle", but in a more specific or genealogical context, they might refer to him as their "uncle-in-law" or "mother's sister's husband".
In some countries, marriages between an individual and their uncle (consanguine or avunculate marriages) are prohibited by law, while in others, such marriages are legal and even common, though now less so. For example, avunculate marriages were prominent in the House of Habsburg, with Charles II of Spain being the son of an uncle-niece marriage. Avunculate marriages were also common among South India's Hindus and in pre-modern societies such as Ancient Egypt. Currently, avunculate marriages are mostly practiced in rural and small to medium-sized cities in South India, particularly in the form of a niece being married to her maternal uncle.
In the United States, there are only two states, Colorado and Minnesota, where an uncle and niece could legally marry, and this is only in the context of established customs of the original tribes of Australia. No state allows the marriage of two people so closely related.
It is important to note that the laws and social norms surrounding marriage vary across different countries and cultures, and it is always advisable to consult local laws and regulations for specific information.
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Genetic risks are associated with avunculate marriages
Marrying one's uncle-in-law is prohibited by law in many countries. However, avunculate marriages, or marriages between an uncle or aunt and their niece or nephew, have been a preferred type of union in some pre-modern societies. Avunculate marriages were common in Ancient Egypt among royalty, and they were also prominent in the House of Habsburg. Currently, avunculate marriages are still practised in rural and small to medium-sized cities in South India, particularly among Hindus.
Avunculate marriages are biologically akin to marriages between half-siblings or a grandparent and grandchild, with the couple sharing approximately 25% of their genetic material. This is a higher degree of genetic relatedness than partners in a marriage between first cousins, who share about 12.5% of their genes. The closer the genetic relationship between the parents, the higher the chances of inheriting the same defective gene.
The primary medical concern with consanguineous marriages is the heightened risk of genetic disorders in children born from such unions. When closely related individuals reproduce, there is a higher probability that both parents carry the same genetic mutation, increasing the likelihood of recessive genetic disorders in their offspring. A 1990 study in South India found that the incidence of malformations was slightly higher in uncle-niece progeny (9.34%) compared to the first cousin progeny (6.18%). Common birth defects associated with consanguinity include heart defects, neural tube defects, limb abnormalities, and intellectual disabilities. Other genetic disorders that are more common in consanguineous marriages include autosomal recessive disorders such as cystic fibrosis, sickle cell anaemia, and Tay-Sachs disease.
In addition to the immediate risk of single-gene disorders, the implications of consanguineous marriages can extend further, impacting the broader health and genetic resilience of communities where the practice is prevalent. Consanguinity can lead to an increase in the expression of deleterious genes, resulting in reduced overall genetic diversity within a family or community. This reduced genetic diversity can have broader implications beyond single-gene disorders, potentially affecting complex traits and the overall health of the population. For instance, it can lead to reduced immunity and increased susceptibility to infectious diseases. Moreover, the accumulation of deleterious mutations over generations can result in a higher prevalence of multifactorial diseases, such as heart disease and diabetes, which are influenced by both genetic and environmental factors.
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Frequently asked questions
No, a woman may not marry her uncle-in-law. This law was established in 1560 and remained unchanged until the 20th century.
An uncle-in-law is your spouse's uncle.
Marrying one's niece is illegal in most places. Avunculate marriages, or marriages between an uncle and niece, were common in pre-modern societies and are still practiced in some places. In the US, only two states allow avunculate marriages: Minnesota and Colorado.
An avunculate marriage is a marriage between a parent's sibling or one's sibling's child.
In an avunculate marriage, the couple is assumed to have inherited 25% of their genes from a common ancestor. This means that their children will have inherited identical gene copies at 1/8 of all their loci, which can lead to a higher risk of malformations.
