
The English language has distinct terms for various relationships, with three sets of terms that cause the most difficulty: cousin, in-law, and half or step relations. The term aunt's brother-in-law's dad refers to a specific familial relationship, and understanding this relationship requires knowledge of kinship terminology. An aunt is the sister of one's parent, and her brother-in-law is her spouse's brother. Therefore, the brother-in-law's father would be the great-uncle of the individual. This relationship is formed through marriage and not by blood. While the terminology provides a clear framework, it can be complex and confusing, especially when dealing with extended family structures.
| Characteristics | Values |
|---|---|
| Relationship | An aunt's brother-in-law's dad |
| Relation to you | Great-uncle |
| Relation to aunt | Father-in-law |
| Relation to brother-in-law | Father |
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What You'll Learn

Aunt's brother-in-law's dad is my grand-uncle
An aunt's brother-in-law's dad is your grand-uncle. This is because your aunt is your parent's sister or brother. Therefore, her brother-in-law is her husband's brother, and his dad is your grand-uncle.
The term "uncle" is used for any of four relationships: a father's brother, mother's brother, father's sister's husband, or mother's sister's husband. The term "aunt" is used for a father's sister, mother's sister, father's brother's wife, or mother's brother's wife.
The terms "aunt" and "uncle" are also used for older relatives who are not direct relatives, especially if the relationship is somewhat distant. For example, "aunt" and "uncle" can be used for family friends or adults who are not otherwise related to the speaker.
The term "-in-law" is used for relationships by marriage, but this is restricted to a few situations. Your sibling's spouse or the sibling of your spouse is a brother/sister-in-law. Your spouse's parents are father/mother-in-law, and you are their son/daughter-in-law.
In some families, people may refer to their sister-in-law's parents as aunt and uncle, even though they are not technically aunt and uncle. In this case, the speaker's children could refer to them as "great aunt" and "great uncle", even though they are not technically great aunt and great uncle.
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Aunt's brother-in-law's dad is my great-grandpa
An aunt's brother-in-law's dad is your great-grandpa. This is because your aunt is your parent's sister, and her brother-in-law is her husband's brother. Therefore, her brother-in-law's father is your grandfather's father, i.e., your great-grandfather.
The terms "aunt" and "uncle" are often used for older relatives who are not direct relatives. For example, "aunt" can refer to your mother's or father's sister, but also to your mother's or father's sister-in-law, or your aunt by marriage. Similarly, "uncle" can refer to your father's brother, but also to your mother's or father's brother-in-law, or your uncle by marriage.
The "-in-law" suffix is typically used to indicate a relationship by marriage rather than by blood. For example, your mother-in-law is your spouse's mother, and your father-in-law is your spouse's father. Your brother-in-law can be the husband of your sister or the brother of your spouse.
In some families, people might refer to their aunt or uncle by marriage's parents as aunt and uncle, even though they are not technically aunt and uncle. In such cases, their children might refer to them as great-aunt and great-uncle. However, "great-aunt" and "great-uncle" are usually reserved for the siblings of one's grandparents.
It is important to note that the terms used to describe family relationships can vary across different cultures and languages.
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Aunt's brother-in-law's dad is my relative by marriage
An aunt's brother-in-law's dad is a relative by marriage. The term "in-law" is used to indicate a relationship by marriage and not by blood. In this case, the relationship is formed through the marriage of your aunt to her brother-in-law, making his father your relative by marriage.
The use of "in-law" in kinship terms is restricted to specific situations. Typically, it is used to refer to a sibling's spouse or the sibling of one's spouse, one's spouse's parents, or one's parents-in-law. In the case of aunts and uncles, the term "aunt" or "uncle" is generally used, regardless of whether the relationship is by blood or marriage. However, to specify a relationship by marriage, one can use the phrases "aunt by marriage" or "uncle by marriage".
In some families, the parents of a sister-in-law or brother-in-law may be referred to as aunt and uncle, even though they are not technically aunt and uncle by strict definition. This usage may vary across families and cultures, and it is always best to clarify the specific relationship when introducing one's relatives.
It is worth noting that the terms "aunt", "uncle", and "cousin" are often used more generally to refer to older relatives who are not direct relatives or family friends, especially if the relationship is somewhat distant. Additionally, the term "cousin" can be used to refer to someone who is several degrees removed or distantly related, such as a shared family name from a common ancestral township.
While there are standard kinship terms to describe various relationships, it is not uncommon for families to have unique ways of addressing relatives, especially in blended families or when relationships are amicable after a divorce. For example, one might continue to refer to their ex-husband's children as nieces and nephews or be referred to as Aunt or Uncle by those children.
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Aunt's brother-in-law's dad is my grandpa
An aunt's brother-in-law's dad is your grandpa. This is because your aunt's brother-in-law is your parent's cousin. Your parent's cousin is your first cousin once removed. The parents of your first cousin once removed are your great-grandparents.
This relationship can be broken down as follows: your aunt is your parent's sister. Your aunt's brother-in-law is her husband's brother or her sister's husband. This means that your aunt's brother-in-law is your uncle by marriage. Your aunt's brother-in-law's dad is, therefore, your grandpa.
The term "in-law" is used to indicate that the relationship is by marriage and not by blood. The "-in-law" suffix is typically restricted to a few situations, including a sibling's spouse or the sibling of one's spouse.
It is worth noting that the terms "aunt", "uncle", and "cousin" are more general, and most people do not expect to know the exact degree of kinship immediately. It is common to refer to family friends or adults without a better explanation as "aunt" or "uncle".
Additionally, the terms "great-aunt" and "great-uncle" are customarily reserved for the siblings of one's grandparents.
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Aunt's brother-in-law's dad is my great-uncle-in-law
The brother-in-law of one of your parents is called your uncle. The term "uncle" is used for any of four relationships: a father's brother, a mother's brother, a father's sister's husband, or a mother's sister's husband.
The term "in-law" is used to indicate a relationship by marriage, rather than by blood. For example, your mother-in-law is your spouse's mother, and your father-in-law is your spouse's father.
Therefore, your aunt's brother-in-law's dad is your great-uncle-in-law. This means that he is the father of your aunt's brother-in-law, who is your uncle by marriage.
It is worth noting that the terms "aunt", "uncle", and "cousin" are more general, and most people do not expect to know the exact degree of kinship immediately. Additionally, "great" is usually reserved for people three generations away from you. In this case, since your aunt's brother-in-law is likely two generations away, their father would be three generations away, making him your great-uncle-in-law.
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Frequently asked questions
Your aunt's brother-in-law's dad is your grand-uncle.
A grand-uncle is the brother of one's grandparent.
Great-uncle is another term for grand-uncle.






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