
The term brother-in-law refers to the brother of one's spouse or the husband of one's sibling. It is a term used to describe a family relationship that arises as a result of marriage rather than shared ancestry. The word in-law itself originates from Middle English, where in-lawe meant a person within the regulation and protection of the law. This term was first recorded in the 1350–1400s and has been a part of the English language ever since.
| Characteristics | Values |
|---|---|
| Definition | The brother of one's spouse; the husband of one's sibling; the husband of one's spouse's sibling |
| Origin | First recorded in 1350–1400; Middle English "brother in law(e)" or "in-lawe", meaning "a person within the regulation and protection of the law" |
| Example | "My wife/husband has a brother, and he is my brother-in-law." |
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What You'll Learn

'Brother-in-law' is a compound noun
The term "brother-in-law" is a compound noun. It refers to the brother of one's spouse or the husband of one's sibling. In other words, it describes the relationship between two men who are related by marriage rather than by blood. The term is used to indicate that the two men are family, despite not sharing a biological connection.
The word "brother-in-law" is derived from Middle English, where the term "in-law" referred to "a person within the regulation and protection of the law." This term was based on the prohibition by Roman civil law and, later, Christian canon law, of marriages within a certain degree of consanguinity, or blood relation. Marriages between close relatives, up to and including first cousins, were prohibited. Thus, the term "in-law" was used to describe these new family relationships created through marriage rather than shared ancestry.
The use of the term "brother-in-law" reflects this distinction between family ties based on blood relation and those based on marriage. For example, if your sister marries someone, her husband becomes your brother-in-law because he is related to you by marriage, not by blood. Similarly, your spouse's brother becomes your brother-in-law because he is your relative by marriage, not by blood.
The term "brother-in-law" is a useful way to describe these complex modern family relationships. It acknowledges that while there is no biological connection, these individuals are still considered family due to the marriage bond. This term helps to clarify these relationships and integrate these new relatives into the family structure.
In summary, the term "brother-in-law" is a compound noun that describes a specific type of family relationship. It refers to men who are related by marriage and helps to distinguish them from those related by blood. This term has been in use since the 14th or 15th century and continues to be a relevant and commonly used word in modern English, as evidenced by its appearance in contemporary news articles.
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It refers to the brother of one's spouse
The term "brother-in-law" is indeed an English word and is commonly used to refer to the brother of one's spouse. This term is used to describe the relationship between a person and their spouse's brother, and it indicates a type of kinship that is not directly related by blood.
In other words, if you are married, your brother-in-law is the brother of your husband or wife. This term helps to establish a clear connection and relationship between individuals within a family structure. It is important to note that the plural form of "brother-in-law" is "brothers-in-law".
The term "brother-in-law" can also be used in a broader sense to refer to the husband of one's sibling or the husband of one's spouse's sibling. This usage captures a similar dynamic and connection within the family structure. For example, if you have a sister, her husband would be considered your brother-in-law as well.
Understanding the various applications of the term "brother-in-law" provides insight into the complexities of family relationships and the unique connections that exist within them. It is interesting to explore how language evolves to accommodate these relationships and how different cultures may have their own unique terms and variations to describe similar connections.
In summary, the term "brother-in-law" is a well-established part of the English language and is used to describe specific relationships within a family dynamic. It refers to the brother of one's spouse, the husband of one's sibling, or the husband of one's spouse's sibling. These definitions help to clarify familial roles and connections, fostering a better understanding of family structures and relationships.
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It also refers to the husband of one's sibling
The term "brother-in-law" refers to the husband of one's sibling. This is one of the meanings of the term, with the other being the brother of one's spouse. These relationships are formed by affinity, a type of kinship that is not directly related by blood.
The reciprocal relationship between a person's spouse and their sibling's spouse is also referred to as a "sibling-in-law". In Indian English, this can be more specifically referred to as a "co-sibling". For example, the husband of one's sibling-in-law is a "co-brother".
The children of one's siblings-in-law are referred to as nieces and nephews, with the specification of "by marriage" if necessary. If one pair of siblings is married to another pair of siblings, their children are double cousins, as the siblings-in-law are doubly related to each other.
In Islamic law (Sharia) and Jewish law (halakha), sexual relations between siblings-in-law are prohibited as incestuous unless the spouse is no longer married. However, in Judaism, there was a custom of yibbum, where a man had a non-obligatory duty to wed his deceased brother's childless widow.
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The term was first recorded in 1350-1400
The term "brother-in-law" is a compound noun used to refer to the brother of one's spouse or the husband of one's sibling. It is a term that signifies a familial relationship that arises due to marriage rather than shared ancestry or biological ties. The term was first recorded in Middle English during the period 1350-1400 as "brother in law(e)", derived from the Middle English term "in-lawe", which meant "a person within the regulation and protection of the law". This origin reflects the historical prohibition, rooted in Roman civil law and later Christian canon law, against marriages within four degrees of consanguinity, encompassing up to and including first cousins.
The emergence of the term "brother-in-law" during the Middle English period is intriguing, as it coincides with a time when family relationships and legal definitions of marriage were undergoing changes and evolving. The use of the term "in-law" specifically denotes a connection established by marriage, distinguishing it from blood relationships. This distinction becomes particularly relevant when navigating the complexities of medieval family structures, where marriage alliances and kinship ties played pivotal roles in societal dynamics.
The Middle English period, spanning from the 12th to the end of the 15th century, witnessed significant developments in the English language. It was a time when the language was transitioning from its earlier form, known as Old English, towards a more recognisable modern version. The influence of the Norman conquest in 1066 introduced a multitude of French and Latin words into the English vocabulary, enriching and transforming the language. Consequently, the emergence of "brother-in-law" as a recognised term during this era reflects the evolving nature of the English language and its capacity to adapt and incorporate new concepts and relationships.
The term "brother-in-law" is a testament to the intricate dynamics of family relationships and the legal frameworks that governed them during the Middle English period. Its first recorded usage during the years 1350-1400 provides a glimpse into the societal norms and linguistic adaptations of that time. The recognition of this term underscores the importance placed on defining familial connections, especially those formed through marriage, and highlights the enduring influence of legal definitions in shaping our understanding of family structures even to this day.
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It indicates a distinction between family ties based on shared ancestry
The concept of kinship is used to describe the culturally acknowledged connections between family members. It encompasses relationships formed through blood connections (consanguineal) and those formed through marriage ties (affinal). In English-speaking societies, the word "brother" refers specifically to a son of one's same parent. However, in many other cultures, the term "brother" may be used more broadly to refer to male cousins or other classificatory kinship terminologies. This indicates a distinction between family ties based on shared ancestry.
The term "brother-in-law" is used to refer to the brother of one's spouse or the husband of one's sibling. This term illustrates the concept of kinship through marriage ties, as the relationship is formed by marriage rather than shared ancestry. In societies that reckon descent bilaterally, such as most Western societies, descent is traced through both the father and mother, without unilineal descent groups. This type of kinship system is also known as the Eskimo kinship system and is typical of bilateral societies.
In contrast, some societies reckon descent patrilineally or matrilineally, or even a combination of both in a system known as double descent. For example, in Navajo society, children are "born for" their father's family but "born to" their mother's family, with clan membership being an important aspect of identity and social expectations. Matrilineal descent is based on the relationship to females in the family line, and in some societies, such as the Afikpo of Imo state in Nigeria, matrilineal ties are considered more important than patrilineal ones.
The distinction between family ties based on shared ancestry is further highlighted by the concept of "chosen kin," who are individuals with no formal blood or marriage ties but who are considered family. Adoptive parents, for example, are culturally recognized as parents even though they are not biologically related to the children they raise. Additionally, in some cultures, nurturing processes are considered the basis for kinship ties, rather than solely relying on genealogical connections.
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Frequently asked questions
Yes, "brother-in-law" is an English word.
A "brother-in-law" is the brother of one's spouse, or the husband of one's sibling.
The word "brother-in-law" was first recorded in Middle English between 1350-1400. The term "in-law" refers to a family relationship based on marriage rather than shared ancestry.
Sure, here are some examples:
- "My brother-in-law bought my sister a new car for her birthday."
- "My brother-in-law is planning a surprise party for John."
- "I have a brother-in-law who is a jazz trumpeter."











































