
In English, there is no specific word to describe the relationship between an individual and their father-in-law's brother. Some people may refer to him as uncle or uncle-in-law, but this is not technically correct. The husband of your wife's sister or the husband of your husband's brother is your brother-in-law, and their father would be your father-in-law's brother. This relationship can be considered extended family, and it is not necessary to have a specific title for the relationship.
| Characteristics | Values |
|---|---|
| Relation | Brother of your father-in-law |
| Honorary Title | Uncle or Uncle-in-law |
| Description | Father of your husband's sister or your wife's sister's husband |
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What You'll Learn

Your father-in-law's brother is not related to you
When you get married, your partner's relatives become your relatives. You use the term "in-laws" when referring to your partner's entire family. Specifically, your partner's father becomes your "father-in-law", and their mother becomes your "mother-in-law". The same goes for their siblings, who become your "brothers-in-law" or "sisters-in-law".
However, this terminology only applies to the spouse's family, not to the siblings of your in-laws. For example, your wife's sister is your sister-in-law, and her husband is your brother-in-law. But this person is not your brother-in-law's father, only your spouse's brother-in-law. He is simply extended family, and you may refer to him by his name or as your spouse suggests.
In some cases, there may be other connections between your family and your brother-in-law's family, which could create a relation. For example, your mother's brother is your father's brother-in-law. But in most cases, your brother-in-law's father would be no relation to you.
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Some people use the honorary title 'Uncle' or 'Uncle-in-Law'
While there is no universally agreed-upon definition of the term "uncle-in-law", it is generally understood to refer to the spouse of one's aunt or the uncle of one's spouse. In other words, an "uncle-in-law" is someone who becomes an uncle by marrying one's aunt or the uncle of one's spouse. In this context, the father of your brother-in-law would technically be nothing to you in terms of familial relations. However, some people may choose to use honorary titles like "Uncle" or "Uncle-in-Law" for the brother of their father-in-law.
The usage of the term "uncle-in-law" is not as straightforward as other kinship terms, and its meaning can vary depending on cultural and personal preferences. For example, in casual conversation, it is common to refer to one's parents' siblings and their spouses as aunts and uncles, even though they are not technically blood relatives.
In genealogical tools and records, it is more precise to refer to individuals related solely by marriage using terms like "my aunt's husband" or "my uncle's wife", rather than extending the "uncle" or "aunt" title to them. This distinction becomes especially important when discussing historical records, as the terminology and cultural understandings of kinship may have differed from the present day.
In summary, while there is no definitive answer, the term "uncle-in-law" is generally understood to refer to the spouse of one's aunt or the uncle of one's spouse. The usage of this term is flexible and can be influenced by personal and cultural preferences, especially in casual conversation. In more formal or genealogical contexts, precision in terminology is often valued to avoid confusion.
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He is the Father of Husband of Sister-in-Law
The term "brother-in-law" is used to refer to the brother of your husband or wife, or the husband of your sister. In the context of the question, "He is the Father of Husband of Sister-in-Law", the person being referred to is the father of the husband of the sister of one's spouse. This person would be considered extended family, and there is no specific term or kinship title in English to refer to this relationship.
In-laws are people who are related to you by marriage. When a person gets married, their spouse's siblings become their brothers-in-law or sisters-in-law. Additionally, the parents of one's spouse become one's father-in-law and mother-in-law. These terms are also used to refer to the parents of one's siblings' spouses. For example, if your sister is married, her husband's parents are her in-laws, and his father is her father-in-law.
In the given scenario, the husband of your sister-in-law is not your brother-in-law, and his father is not directly related to you. They are considered extended family, and there is no specific term to refer to their relationship to you. The most accurate way to describe their relationship would be "Father of Husband of Sister-in-Law" or a similar phrase.
It is worth noting that some people may choose to use informal kinship terms or nicknames, such as "Uncle", to refer to such extended family members, especially if they feel a close connection to them. However, this is a matter of personal preference and there is no standard or widely recognized term for this specific relationship.
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You can ask him what he'd like to be called
When it comes to addressing your father-in-law's brother, it's important to note that there isn't a specific familial term for this relationship in English. Some people may refer to him as "Uncle" or "Uncle-in-Law," but these terms are not technically accurate. The relationship can be described as "extended family."
Given the lack of a standardized term, it's perfectly acceptable to ask him how he would like to be addressed. You can initiate a conversation about this by expressing your curiosity about the appropriate form of address. For example, you could say something like, "I noticed that there isn't a standard term for our relationship. Would you prefer if I called you by your name or would you like me to use an honorary title like 'Uncle'?""
By asking for his preference, you show respect for his perspective and create an opportunity for a meaningful discussion. It demonstrates your willingness to navigate this unique family dynamic in a thoughtful and considerate manner.
- Express curiosity and ask for his opinion: "I've always wondered what the best way to address this unique relationship is. Would you prefer me to call you by your name or is there another title you'd like me to use?"
- Offer a range of options: "I know some people refer to their father-in-law's brother as 'Uncle' or by their name. What do you think sounds best for our situation?"
- Seek his guidance: "I want to make sure I address you in a way that makes you comfortable. How would you like me to introduce you to others or refer to you in conversations?"
- Provide context and ask for his preference: "Since our relationship doesn't fall into the typical in-law categories, I wanted to ask if you had any preference for how I address you. Your thoughts on this would be much appreciated."
Remember, the key is to approach this with respect and openness. By asking for his input, you acknowledge the importance of his perspective and foster a more personalized connection.
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He would be your spouse's uncle, but not yours
When you get married, your partner's relatives become your relatives. The term "in-laws" is used to refer to your partner's entire family. Specifically, your partner's father becomes your "father-in-law".
Now, your father-in-law's brother would be your spouse's uncle, but not yours. This is because relations only extend to the person marrying into your family. In other words, your in-laws' relatives are not necessarily your relatives. This is why your spouse's sister's husband is your brother-in-law, but his father is not your uncle-in-law.
Some people may use the honorary title of "uncle" or "uncle-in-law" for their father-in-law's brother, but this is not technically accurate. If you are with your in-laws' family, you may call him whatever your spouse calls him. You could also ask him if he has a preference for what he would like to be called, such as "Uncle Bob" or just "Bob".
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Frequently asked questions
Your father-in-law's brother is not a direct relative of yours. Some people may refer to him as "Uncle" or "Uncle-in-Law", but this is not technically accurate.
The husband of your sister-in-law is not your brother-in-law. He is the husband of your sister-in-law.
Your brother-in-law is the husband of your sister or the brother of your spouse.
Your mother's brother is your father's brother-in-law.











































