It is called your sister-in-law.
Understanding the Term
When you marry, the members of your spouse's family become your relatives by marriage, often referred to as your "in-laws." This terminology helps distinguish these relationships from those with your own blood relatives.
According to the Britannica Dictionary, the term for your spouse's sister is specifically sister-in-law. The reference states, "If your spouse has a sister, she is your sister-in-law." Similarly, the brother of your spouse is called your brother-in-law.
Common In-Law Relationships
Marriage creates new familial connections. Here are some of the most common relationships by marriage:
- Sister-in-law: Your spouse's sister, or your brother's wife.
- Brother-in-law: Your spouse's brother, or your sister's husband.
- Mother-in-law: Your spouse's mother.
- Father-in-law: Your spouse's father.
These terms provide a clear way to identify these new family members resulting from your marriage.
