
Dating can be challenging, and it can be difficult to know if you should pursue a potential relationship, especially when family connections are involved. In the case of dating your brother-in-law's cousin, there are a few considerations to make. Firstly, it is important to note that as long as there is no blood relation, it is generally considered acceptable to date your cousin-in-law. While some people may find it unusual, it is not considered socially unacceptable, and it is quite common, with about 10% of marriages worldwide being between second cousins or closer. Additionally, if you are concerned about the genetic implications of dating a relative, it is worth noting that first cousins only share 12.5% of their genetic ancestry, and the chances of producing offspring with abnormalities are relatively low. However, it is essential to consider the potential for family dynamics to become complicated if the relationship progresses or ends. Therefore, it is advisable to take things slow, communicate openly, and be mindful of potential challenges.
| Characteristics | Values |
|---|---|
| Nature of the relationship | Not blood-related |
| Legality | Legal to marry a first cousin in about half of the U.S. |
| Social acceptability | Some people may find it "weird" |
| Genetic risks | A first cousin shares only 12.5% of genetic ancestry, resulting in similar chances of abnormalities in offspring as any other non-related couple |
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What You'll Learn

It's not incest, so it's not illegal
It is not uncommon for people to wonder about the appropriateness of dating their brother-in-law's cousin. While some may consider it “weird," it is not incest and therefore not illegal. Here are some reasons why dating your brother-in-law's cousin is not incestuous and is within acceptable social norms:
Firstly, it's important to understand that you and your brother-in-law's cousin are not blood relatives. Your brother-in-law is only related to you by marriage, and their cousin is not a blood relative of yours. Therefore, dating them does not constitute incest, which involves sexual relations between close blood relatives.
Secondly, even if you were to consider extended family relationships, the cousin of your brother-in-law is still a fairly distant relative. A first cousin only shares 12.5% of your genetic ancestry, and the chances of producing offspring with serious abnormalities are similar to the percentage of genetic ancestry shared. So, from a scientific perspective, there is less concern about potential genetic issues in any future offspring.
Additionally, societal norms and perspectives on cousin marriages vary across cultures and regions. In about half of the United States, it is perfectly legal to marry a first cousin, and approximately 10% of marriages worldwide are between second cousins or closer. While some may still find it unusual, it is not uncommon, and societal views on such relationships are evolving.
Finally, if you and your brother-in-law's cousin are both consenting adults and there are no legal or biological impediments, it is essential to consider your feelings and happiness. If you have a genuine connection and chemistry, it may be worth exploring the relationship, understanding that you may face some social perceptions and potential challenges within the family dynamic.
In conclusion, dating your brother-in-law's cousin is not incest, and while it may be unusual for some, it is not illegal or inherently immoral. It is essential to consider your feelings, the potential social implications, and the happiness of all parties involved.
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It might be considered socially unacceptable
Dating your brother-in-law's cousin may be considered socially unacceptable due to the potential for family dynamics to become complicated. While there is no blood relation between you and your brother-in-law's cousin, dating within the family can be seen as unconventional and even “weird" by some. This is especially true if you and your brother-in-law's cousin have pre-existing relationships or a history together.
Additionally, societal norms and cultural contexts may play a role in perceiving such relationships. In some societies, dating cousins or close relatives is frowned upon due to religious, cultural, or ethical beliefs. These beliefs often stem from concerns about genetic abnormalities in potential offspring, as cousins share a portion of their genetic ancestry. However, it is important to note that the chances of producing offspring with serious abnormalities are relatively low, similar to the percentage of genetic ancestry shared.
Furthermore, the potential for awkward family gatherings and complicated dynamics if the relationship ends is a consideration. If you and your brother-in-law's cousin were to date and then break up, it could create tension or discomfort within the family, especially if the cousin and your brother-in-law are close. This could lead to challenging situations during holidays, family events, or gatherings where both of you are present.
While there are no legal restrictions on dating your brother-in-law's cousin, societal perceptions may vary. Some people may view it as acceptable, especially if there is no blood relation involved. However, others may find it unusual or even unacceptable due to their personal beliefs or cultural background.
Ultimately, the decision to date your brother-in-law's cousin depends on various factors, including personal values, family dynamics, and societal norms. It is essential to consider the potential consequences and complexities that may arise and proceed with caution to navigate any challenges that may occur.
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There are genetic risks to having children with blood relatives
While there are no explicit laws prohibiting it, dating your brother-in-law's cousin may be considered socially unacceptable in some cultures. However, it is important to note that this is a complex and nuanced topic, and societal views on cousin relationships vary widely.
Now, regarding the potential genetic risks of having children with blood relatives:
It is important to understand the concept of consanguinity, which refers to relationships between blood relatives. Consanguineous unions, or marriages between close relatives, are more common than many people realize and are deeply rooted in various cultures, particularly in the Middle East, West Asia, and North Africa. While it is true that marriages between blood relatives can lead to an increased risk of certain genetic disorders in their children, it is not a guarantee that their offspring will be affected. The likelihood of genetic issues depends on the degree of relatedness between the parents.
First cousins, for example, share about one-eighth of their genetic makeup. This means that they have a higher chance of both being carriers of the same recessive gene mutation. If both parents are silent carriers of a particular gene mutation and each passes on the mutated gene, their child may inherit a "double dose" of that faulty gene, resulting in an autosomal recessive disorder. Examples of such disorders include cystic fibrosis, thalassemia, sickle cell disease, spinal muscular atrophy, and some neurological and metabolic diseases. However, it is important to note that most children born to cousins are healthy and unaffected.
The risk of autosomal recessive disorders decreases as the degree of relatedness between the parents becomes more distant. For instance, if the parents are second cousins, the risk of severe disease in their children is not significantly higher than the risk in the general population. Additionally, the risk of birth defects due to multifactorial inheritance, such as cleft lip, spina bifida, polydactyly, and congenital heart disease, is also elevated in consanguineous unions.
If you are considering starting a family with a close relative, it is essential to consult a medical geneticist or genetic counsellor. They can provide guidance, assess your family history, and calculate your specific risks. By understanding the potential risks, you can make informed choices and take proactive measures to promote a healthy pregnancy and child.
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It could make family gatherings awkward
While dating your brother-in-law's cousin may be socially acceptable, it could make family gatherings awkward. This is especially true if the relationship ends on bad terms. Even if the relationship is going well, you may face judgment or criticism from family members who disapprove of the relationship. This could create tension and conflict within the family, leading to uncomfortable situations at gatherings.
Additionally, the potential for awkwardness increases if the cousin and your brother-in-law are close. In this case, your brother-in-law may feel caught between their cousin and their spouse's family. They may struggle to maintain their relationships with both parties, which could result in further tension and discomfort during family gatherings.
The level of acceptance from your family will also play a role in the dynamics at gatherings. If your family members are supportive and open-minded, they can help create a comfortable environment for everyone. On the other hand, if they are judgmental or disapproving, it can lead to strained interactions and uncomfortable situations.
Furthermore, if children are involved, especially those who are close to their cousin-in-law, the dynamics can become even more complex. The children may struggle to understand the situation, and their emotions and reactions should be considered as well.
While it is important to consider the potential for awkwardness at family gatherings, it should not be the sole deciding factor in pursuing a relationship. Open communication, empathy, and respect for one another can help navigate these challenges and create a more harmonious environment for everyone involved.
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It's not uncommon for people to date their cousins
While opinions vary on the merits of dating your cousin, it is certainly not uncommon. Cousin marriage is quite common around the world, especially in the Middle East, South Asia, and North Africa. About 10% of the world's couples are first or second cousins, which equates to more than 750 million people. In some cultures, cousin marriages are considered ideal and are actively encouraged and expected. For example, in Iraq, it is common for people to marry their cousins.
Historically, cousin marriage was practiced by indigenous cultures in Australia, North America, South America, and Polynesia. In Europe and North America, cousin marriage was also once prevalent. Several notable figures, including Charles Darwin, Edgar Allan Poe, and Albert Einstein, married their first cousins. Queen Elizabeth II is also married to her cousin, Prince Philip.
However, in some jurisdictions, cousin marriage is legally prohibited or stigmatized. For example, in the United States, the laws regarding cousin marriage vary by state, with some states banning the practice altogether. In China, a legal ban on first-cousin marriage was enacted in 1981 due to potential health concerns.
It is worth noting that dating or marrying a cousin-in-law, as in your specific case, may be viewed differently from dating a blood cousin. The social and cultural perceptions surrounding cousin-in-law relationships may differ, and it is important to consider the dynamics and potential challenges of such relationships.
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Frequently asked questions
No, it's not weird. You aren't related by blood, so there are no issues with inbreeding. However, you may want to talk to your cousin's wife and ask her how she feels about it.
It's not uncommon for people to find the idea of dating cousins or in-laws strange. However, it's perfectly legal to marry your first cousin in about half of the US, and approximately 10% of marriages worldwide are between second cousins or closer relatives.
Future family events could be awkward if you break up. It's a good idea to take things slow and keep the relationship between the two of you at first.
A first cousin shares only 12.5% of your genetic ancestry. Studies show that the chances of producing offspring with serious abnormalities are about the same as the percentage of genetic ancestry shared.











































