
The concept of in-laws refers to people who are related to you by marriage. Your father-in-law is the father of your spouse, and your brother-in-law can be your wife's brother or your sister's husband. Therefore, your brother can be your father-in-law if he is the father of your spouse. However, it is important to note that the term brother-in-law does not imply a direct paternal relationship, and your brother-in-law's father is not considered your father-in-law unless they are the parent of your spouse.
| Characteristics | Values |
|---|---|
| Brother-in-law | The husband of your sibling or the brother of your spouse |
| Father-in-law | The father of your spouse |
| Relationship between brother and father-in-law | None, unless there is a common ancestor |
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What You'll Learn

Brother-in-law is not a blood relative
The term "brother-in-law" is used to refer to the brother of one's spouse, or the spouse of one's sibling. This means that a brother-in-law is not a blood relative but is instead a relative through marriage.
In-law relationships are formed through the marriage of two individuals, and the in-law relationship terms are always written with hyphens. For example, "brother-in-law" refers to the brother of one's spouse, while "sister-in-law" refers to the sister of one's spouse. The husband of one's daughter is referred to as a son-in-law, and the wife of one's son is referred to as a daughter-in-law.
In the context of divorce and remarriage, the new spouses of one's parents are considered stepparents, not in-laws. Additionally, the children from a spouse's previous marriage are considered stepchildren, rather than sons-in-law or daughters-in-law.
While the term "brother-in-law" specifically refers to the brother of one's spouse or the spouse of one's sibling, it is worth noting that some people may use the term in a broader sense to refer to any male relative connected by marriage, such as the spouse of one's spouse's sibling. However, this usage is not universally accepted and can be a matter of personal preference.
In summary, the term "brother-in-law" typically refers to a relative through marriage, and not a blood relative. The specific usage of the term can vary depending on personal preference and the cultural context.
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In-laws are people related by marriage
Your brother-in-law could be your wife's brother or your sister's husband. The husband of your daughter is your son-in-law, and the wife of your son is your daughter-in-law. If your spouse has children from a previous marriage, those are your stepchildren, not sons-in-law or daughters-in-law. You are their stepfather or stepmother, not their father-in-law or mother-in-law.
Your in-laws include your spouse's siblings, your spouse's parents, and your siblings' spouses. For example, your wife's sister is your sister-in-law, and her husband is your brother-in-law. However, the husband of your wife's sister is not typically considered your brother-in-law.
In some cases, the term "in-law" can be used more broadly to refer to extended family related by marriage. For example, your brother-in-law's parents could be referred to as your "brother-in-law's parents." Similarly, your sister's husband's parents could be referred to as your "sister's parents-in-law."
It is important to note that divorced spouses can no longer refer to each other as "husband" or "wife" but must use the terms "ex-husband" or "ex-wife." Remarriage can also impact in-law relationships, as the new spouses of your parents would be your stepparents, not your mother-in-law or father-in-law.
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The husband of your sibling is your brother-in-law
In-laws are typically reserved for your spouse's siblings, parents, and your siblings' spouses. For example, the parents of your brother-in-law are your brother-in-law's parents, not your parents-in-law. However, there is some flexibility in how people choose to refer to each other. For instance, you could refer to your ex-husband's stepbrother as your brother-in-law if you are on good terms.
The husband of your sibling is not considered your father-in-law. Your father-in-law is the father of your spouse. Similarly, the wife of your son is your daughter-in-law, and the husband of your daughter is your son-in-law. If your spouse has children from a previous marriage, those are your stepchildren, not your sons-in-law or daughters-in-law.
In some cultures and languages, there may be specific terms to refer to extended family members, such as your sister's husband's parents. However, in English, there is no widely recognised term beyond "my sister's parents-in-law".
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The father of your spouse is your father-in-law
The term "father-in-law" specifically refers to the father of your spouse. So, if you are married to someone, your father-in-law is the father of your husband or wife. This term is used to describe the relationship between you and your spouse's father, which is a relationship created through marriage.
It is important to note that in-law relationships are distinct from blood relationships or step-relationships formed through divorce and remarriage. For example, if your parents were to divorce and remarry, their new spouses would be your stepparents, not your mother-in-law or father-in-law. Similarly, the children of your spouse from a previous relationship are your stepchildren, not your sons-in-law or daughters-in-law.
In some cultures and families, the term "in-law" may be used more broadly to include extended family members related by marriage, such as cousins-in-law or uncles- and aunts-in-law. However, in the English language, there are no widely recognised terms for certain relationships, such as the parent of your sibling-in-law. In such cases, a general term like "extended family" may be used, or a preference for a specific form of address can be established within the family.
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Your brother-in-law's father is not your father-in-law
In-law relationships can be confusing, especially when it comes to extended family members. So, let's break down the relationship "your brother-in-law's father" and clarify why he is not your father-in-law.
Firstly, it's important to understand the basic in-law relationships. Your father-in-law is the father of your spouse. Similarly, your brother-in-law is your spouse's brother or your sibling's spouse. These are the fundamental in-law relationships from which other connections are derived.
Now, let's apply these definitions to the scenario at hand. Your brother-in-law's father is the father of your brother-in-law. Since your brother-in-law is either your spouse's sibling or your sibling's spouse, their father would be your spouse's parent's sibling or your sibling's spouse's parent. In neither case is this person your father-in-law.
It's worth noting that in-law relationships are typically defined by the direct connections formed through marriage. In this case, the relationship between your brother-in-law's father and yourself is one step removed from the direct in-law relationship. Therefore, it is more accurate to refer to him as extended family or use a descriptive term such as "the father of my brother-in-law".
While it may be convenient to use shorthand terms like "uncle-in-law" or "brother of my father-in-law" for simplicity or familiarity, it is important to recognize that these terms are not technically accurate in this context. The relationship described here is one that is extended by one degree of separation from the core in-law relationships. Therefore, your brother-in-law's father is not your father-in-law.
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Frequently asked questions
No, your father-in-law is the father of your spouse.
No, your brother-in-law is your spouse's sibling or your sibling's spouse.
No, your brother-in-law's father is not related to you.
Yes, your brother can be your brother-in-law if he is married to your sibling's spouse.


























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