
Marrying one's cousin has been a topic of debate in the United Kingdom, with some calling for it to be banned due to health risks and others arguing that a ban would be ineffective. While cousin marriage is legal in the UK, it is prohibited in some countries and cultures due to concerns about inbreeding. The practice has a long history, with varying degrees of acceptance across different societies and communities. In the UK, it has been associated with specific diaspora communities, and there are concerns about the impact of such marriages on public health, particularly the risk of birth defects and genetic disorders in children.
| Characteristics | Values |
|---|---|
| Current UK Law | Marrying your cousin is legal |
| History | Outlawed in the 5th century, legalised in 1540 by Henry VIII |
| Prevalence | 10% of marriages worldwide are between first or second cousins |
| Health Risks | Children of first cousins have a 4-6% risk of autosomal recessive genetic disorders |
| Medical experts say it can cause genetic diseases in children | |
| Public Opinion | MPs have called for a ban, citing health risks and threats to women's freedom |
| Some argue a ban would be ineffective and that education is a better approach |
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What You'll Learn

Cousin marriage is currently legal in the UK
The practice was common in earlier times and continues to be common in some societies today. In the UK, cousin marriage is more prevalent in certain communities, such as the British Pakistani community, where it is a common tradition. However, attitudes among younger generations are shifting, with reports of figures falling sharply in some areas.
There are health risks associated with cousin marriage, as the children of first cousins are at a greater risk of birth defects and inheriting serious disorders. This has led some MPs to call for a ban on cousin marriage in the UK, arguing that it threatens women's freedom and is not conducive to modern British society. However, others argue that a ban would be ineffective and that the issue is better addressed through education and health awareness programmes.
The UK government has indicated that it has no plans to change the law, and without government support, such bills are unlikely to become law. As a result, cousin marriage remains legal in the UK, and it is up to individuals to decide whether to marry their cousin or not.
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MPs have called for a ban on cousin marriage
In the UK, cousin marriage has been a topic of debate, with some MPs calling for a ban on the practice. The primary arguments in favour of a ban centre around health risks, particularly the increased risk of birth defects in children born to first cousins. Conservative former minister Richard Holden, who introduced the proposals in Parliament, cited research suggesting that the child of first cousins carries around double the risk of inheriting a serious disorder compared to the child of unrelated parents. This position is supported by Shadow Justice Secretary Robert Jenrick, who stated that the "medical evidence is overwhelming".
However, the risk of birth defects in children of first cousins is contested. Some sources indicate that while there is a slightly higher risk, the absolute risk increase is comparable to factors such as older maternal age, obesity, and smoking. Additionally, independent MP Iqbal Mohamed argued that a ban would be ineffective and that the issues would be better addressed through education and awareness programmes. Physician Alan Bittles also stated that a ban would be a mistake, citing the need for further study and the long-standing historical acceptance of the practice within some communities.
Another argument in favour of banning cousin marriage is the potential threat to women's freedom. Holden and Jenrick suggested that women and girls in certain communities may be pressured into cousin marriages due to strict honour codes and clan mentalities. However, Mohamed countered that a ban would not effectively protect women's freedom and that the focus should instead be on preventing forced marriages and addressing the cultural factors that contribute to the continuation of the practice.
It is important to note that cousin marriage is not universally prohibited in the UK, with some diaspora communities, such as Irish Travellers and British Pakistanis, having "extremely high rates" of 20-40%. Historically, cousin marriage was practised by the British aristocracy and was legalised by King Henry VIII in 1540 to allow him to marry his fifth wife, Catherine Howard, who was his cousin. Currently, the UK government has indicated that it has no plans to change the law regarding cousin marriage, as it focuses on other legislative priorities.
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Cousin marriage is more common in some diaspora communities
Cousin marriage is legal in the UK, but it is not common. However, certain diaspora communities have extremely high rates of first-cousin marriage, with a rate of 20% to 40% among Irish Travellers and higher rates among the British Pakistani community. In the 1980s, researchers found that children of closely related Pakistani parents had an autosomal recessive condition rate of 4% compared with 0.1% for a European group. The overall prevalence of first-cousin marriage is low in Western countries, but it is practised by about 10% of the world and is most prevalent in the Middle East, West Asia, and North Africa. Cousin marriage is also common in some communities in South India, with 30% of marriages in Andhra Pradesh in 1967 involving cousins, declining to 26% by 2015-2016.
In the Middle East, cousin marriage is allowed in all Islamic schools of thought, and it was common in the eighth-century Umayyad Caliphate. In some parts of rural Pakistan, the rate of cousin marriage is over 80%. In Iraq, 47-60% of marriages are consanguineous, according to a 2009 study. Cousin marriage is also common in some Jewish communities, such as the Mountain Jews in the Southern Caucasus, and in some Christian communities, such as the Coptic Church in Egypt, which banned the practice in 2024.
Cousin marriage has been justified for various reasons, including preserving family wealth, maintaining geographic proximity, keeping traditions alive, and strengthening family ties. However, it has also been criticised due to concerns about inbreeding and the increased risk of birth defects and genetic disorders in the children of first cousins. The risk of autosomal recessive genetic disorders is 4-6% for children of first cousins, compared to 3% for children of unrelated parents.
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Cousin marriage can lead to a higher risk of birth defects
In the UK, cousin marriage is legal, but there have been calls to ban the practice. Conservative MP Richard Holden introduced proposals to ban first-cousin marriage, citing the increased risk of birth defects in children born to first cousins. Holden referenced research suggesting that the child of first cousins carries around double the risk of inheriting a serious disorder compared to the child of unrelated people.
The rate of first-cousin marriage varies across different diaspora communities in the UK. For example, there are extremely high rates of 20-40% among Irish Travellers and the British Pakistani community. In parts of rural Pakistan, the rate is even higher, reaching over 80%.
The higher risk of birth defects in children born to first cousins is supported by several studies. A study in Bradford, West Yorkshire, found that marriage to a blood relative accounted for nearly a third (31%) of all birth defects in babies of Pakistani origin. The risk of birth defects rose from 3% in the general Pakistani population to 6% among those married to blood relatives. The study also found a doubling of the risk in the babies of white British women over the age of 34.
Another study in Norway, which has a significant Pakistani community, found a higher incidence of first-cousin marriage in this community. However, the incidence has been declining, partly due to a health education campaign to inform people of the risks.
While some argue that the health risks associated with first-cousin marriage warrant a ban on the practice, others believe that a more effective approach would be to address it as a health awareness issue. Independent MP Iqbal Mohamed suggested that advanced genetic test screening for prospective married couples could be facilitated instead of stigmatising those who are in cousin marriages or inclined to be.
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Cousin marriage is viewed differently in other cultures and societies
Cousin marriage is a topic of debate in the United Kingdom, with some calling for it to be banned due to health risks and others arguing that a ban would be ineffective and infringe on cultural rights. While the practice is uncommon in Western countries, it is prevalent in other parts of the world, such as the Middle East, West Asia, and North Africa.
In some societies, cousin marriage is viewed as a means of strengthening family bonds, preserving family wealth, and maintaining cultural traditions. For example, in Pakistan, cousin marriage is common for economic, religious, and cultural reasons. Similarly, in Middle Eastern societies, cousin marriage is linked to tribal traditions and expanding economies, with rich families marrying within their social circles to protect their wealth. Additionally, the notion of honour is closely associated with cousin marriage in these societies, as it can prevent a loss of face if a cousin becomes pregnant out of wedlock.
In contrast, other cultures may view cousin marriage as taboo or forbidden due to religious or cultural beliefs. For instance, two of the Sunni Muslim madhhabs, Shafi'i and Hanbali, consider cousin marriage as "Makruh" or disliked. The Hindu Marriage Act also prohibits marriage for five generations on the father's side and three on the mother's side, although it allows cross-cousin marriage in certain cases.
Cousin marriage can also have complex rules and taboos within societies. For example, some societies may restrict certain types of cousin marriages or require consent from family members. In some Middle Eastern societies, a marriage to the father's brother's daughter is considered ideal, but this type of cousin marriage may not always be the most prevalent.
The perception of cousin marriage varies widely across cultures and time periods, and understanding these differences can provide valuable insights into the social and cultural dynamics of human societies.
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Frequently asked questions
Yes, it is currently legal to marry your cousin in the UK. However, there have been recent calls for this to change.
MPs have argued that first-cousin marriage puts the children of first cousins at greater risk of birth defects and that the practice should be prohibited to protect public health.
Medical experts have said that first-cousin marriage can cause genetic diseases in any children the couple may have. The risk of autosomal recessive genetic disorders is 4-6% in children of first cousins, compared to 3% for the children of unrelated parents.
Some people who marry their cousins say they never questioned getting married and that they would be happy for their daughters to marry a first cousin.











































