
The concept of being both a cousin and a son-in-law is intriguing and complex, with cultural and legal nuances. Navigating family titles can be puzzling, especially when distinguishing between blood and marital connections. A cousin-in-law can refer to two relationships: the spouse of one's cousin or the cousin of one's spouse. This term bridges familial and marital ties, adding another branch to the family tree. While there's no legal significance, socially it matters. Some cultures encourage cousin marriages, while others stigmatize them. Historically, up to 80% of marriages were between cousins, but now it's around 10%. Cousin marriages are more common in the Middle East, with over half in some countries, but are banned or discouraged in many U.S. states due to perceived genetic risks.
| Characteristics | Values |
|---|---|
| Definition | A cousin-in-law is the spouse of one's cousin or the cousin of one's spouse |
| Synonyms | Cousin's wife/husband, co-in-law, cousinlaws |
| Blood relation | No |
| Family tree | A cousin-in-law is a relative in the sense that they are part of one's family tree |
| Children | The children of a cousin-in-law are one's first cousins once removed |
| Degrees of separation | First cousins are a type of third-degree relative |
| Marriage laws | The legality of cousin marriage varies across U.S. states |
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What You'll Learn

A cousin-in-law is a relative
The term "cousin-in-law" is used to refer to two distinct relationships: either the spouse of one's biological cousin or the biological cousin of one's spouse. This term bridges both familial and marital connections, providing a clear description of the relationship between non-blood relatives. While there is no legal basis for the term, a cousin-in-law is considered a relative as they are connected through marriage and are part of one's family tree.
The usage of the term "cousin-in-law" can be subjective and vary across different cultures and families. Some individuals may prefer to use terms such as “cousin's wife” or “cousin's husband” to describe the relationship. Ultimately, the chosen terminology depends on personal preference and the level of precision desired in describing familial relationships.
In certain situations, the term "cousin-in-law" can be ambiguous, especially when considering the direction of "once removed." For example, when referring to "my cousin's spouse," it is unclear whether the speaker means their cousin's spouse or their parent's cousin's spouse. To avoid confusion, it may be clearer to use phrases like "my cousin's wife/husband" or "my grandparents' son/daughter-in-law."
Despite the lack of a legal basis for the term, a cousin-in-law is generally accepted as a relative from a social and genealogical perspective. They become part of one's family through marriage, and their children will share a genetic connection with the speaker's cousins. This connection further solidifies their place within the family tree and reinforces their status as a relative.
The level of closeness between cousins-in-law and the speaker's family can vary. If there is frequent interaction between the families, friendships may form, and their children may grow up together, creating a stronger sense of familial bond. Ultimately, the cousin-in-law relationship adds another branch to the family tree and expands the circle of relatives.
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Cousin-in-law vs. cousin's spouse
The term "cousin-in-law" is used to refer to two distinct relationships: either the spouse of one's biological cousin or the biological cousin of one's spouse. This term is used to describe the relationship between non-blood relatives, as a cousin-in-law is not a blood relation.
The usage of the term "cousin-in-law" can be confusing and ambiguous, especially when considering the direction of "once removed". For example, saying "my cousin's spouse" could refer to either your cousin's spouse or your parent's cousin's spouse. To avoid this confusion, you could refer to them as "my grandparent's son/daughter-in-law", as this provides a clearer context for the relationship.
In some cultures, there are precise terms for such distant familial relationships, but the English language does not have specific words for these relationships. In Anglo-Saxon culture, the term "cousin" is used for someone with whom we share a common ancestor, although it is now used more broadly. In practice, people often refer to their cousin's spouse as simply their "cousin", just as one might refer to their aunt when talking about their "uncle's wife".
The level of closeness between cousins-in-law will likely depend on the relationship between the cousins themselves. If the cousins see each other often, their spouses may also form a friendship, and their children may grow up knowing each other. In this case, the cousins-in-law would be considered part of the family, adding another branch to the family tree.
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Cousin-in-law is not a blood relation
The term "cousin-in-law" refers to two distinct relationships: either the spouse of one's biological cousin or the biological cousin of one's spouse. This term bridges both familial and marital connections, providing a clear description of the relationship between non-blood relatives. While a cousin-in-law is a real relative in the sense that they become part of your extended family through marriage, they are not a blood relation.
Your cousin's spouse is not related to you in DNA or blood, but their children will be. These children are your first cousins once removed. Similarly, your cousins' children would be the second cousins to your children. Their children are part of the same generation as you but with an additional generation between you and your common ancestor.
The closeness between you and your cousin-in-law will likely depend on the relationship between you and your cousin. If you see each other often, you may form a friendship, and your children can grow up knowing one another.
While there is no legal reason behind the name, your cousin-in-law is a relation on your family tree as this person married your cousin or is your spouse's cousin. You can call your cousin-in-law your cousin's wife or husband, or simply your cousin-in-law. Cousin-in-law is a more accurate description from a genealogical point of view, but other people will understand the relationship whichever description you use.
In terms of inheritance, direct relations usually have priority over in-law connections. For example, if your cousin dies without a will, the law typically grants inheritance based on bloodlines first. Your cousin-in-law, being part of the acquired family, wouldn't usually have inheritance rights. However, legal rights and constraints related to cousin-in-law relationships can vary.
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Cousin-in-law: a spouse of one's cousin
The term "cousin-in-law" is used to describe two distinct relationships: either the spouse of one's biological cousin or the biological cousin of one's spouse. This term is used to describe the relationship between non-blood relatives, as one's cousin-in-law is not related by DNA or blood. However, their children will share some DNA with one's cousin and, by extension, with oneself.
The term "cousin-in-law" is useful for bridging both familial and marital connections and providing a succinct descriptor for the relationship. While there is no legal reason for the term, a cousin-in-law is still considered a relative as they are part of one's family tree. If they have children with one's cousin, those children will also be part of the family tree. These children are specifically referred to as "first cousins once removed".
The level of closeness between cousins-in-law will likely depend on the relationship between cousins. If the cousins see each other often, their spouses may form a friendship, and their children may grow up knowing each other. In social situations, it is recommended to refer to one's cousin-in-law in the way they prefer to be addressed. While the term "cousin-in-law" is more accurate from a genealogical perspective, other terms such as "cousin's wife" or "cousin's husband" are also commonly used and understood.
In English, there is some ambiguity in the terminology used to refer to cousins-in-law, as the term "once removed" can refer to either direction along a family tree. This can lead to confusion when specifying the exact relationship between individuals. Some other languages have more precise terms for these distant familial relationships.
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Cousin-in-law: a cousin of one's spouse
The term "cousin-in-law" is used to refer to two distinct relationships. Firstly, it can refer to the spouse of one's biological cousin. Secondly, it can refer to the biological cousin of one's spouse. This term bridges both familial and marital connections, providing a clear description of the relationship between non-blood relatives. While there is no legal basis for the term, it is still a recognised relationship, as the spouse of your cousin will share some of the same DNA as your cousin, and their children will enter your family tree.
The closeness of the relationship between a person and their cousin-in-law will likely depend on the closeness of their relationship with their cousin. If the two see each other often, they may form a friendship, and their children may grow up knowing each other.
The term "cousin-in-law" is considered more accurate from a genealogical perspective, but in social situations, it is common to simply refer to the person as your "cousin" or "my cousin's husband/wife". The term “co-in-law” has also been used to refer to the cousin of one's spouse, but this is uncommon.
The term "cousin-in-law" can be ambiguous, as “once removed” can refer to either up or down a generation. For example, "my cousin-in-law" could refer to my cousin's spouse, or my parent's cousin's spouse. To be more precise, one could refer to their "first cousin-in-law", or "first cousin's husband/wife".
In some cultures, cousin marriages are common, and they are important in several anthropological theories. Cousin marriages are often arranged, and they can serve to strengthen family ties, conserve wealth, protect cultural heritage, and maintain power structures within families and communities.
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Frequently asked questions
A cousin-in-law is the spouse of one's cousin or the cousin of one's spouse. They are not a blood relation but are considered a relative as they are part of one's family tree.
A cousin is a blood relative with whom you share a common ancestor, whereas a cousin-in-law is not a blood relation but is related to you by marriage.
The children of cousins-in-law are first cousins once removed. Their children would be second cousins to each other.











































