What Is a Sister-in-Law Daughter Called
A sister-in-law daughter is commonly called a niece. In family terminology, she is the daughter of your spouse’s sister or your sibling’s spouse. This relationship is created through marriage rather than blood.
How the Relationship Is Defined
Your sister-in-law is your spouse’s sister or the sister of your spouse. Her daughter is therefore your niece by marriage. Some cultures also use the broader term niece for any daughter of a sibling or in-law.
Why Understanding Family Terms Matters
Knowing correct family labels helps with legal documents, inheritance discussions, and clear communication. It also supports financial planning, especially when roles like guardianship or beneficiary designations are involved.
Quick Summary
In most English-speaking contexts, a sister-in-law daughter is called a niece. For more details on family relationship terms, see the Merriam-Webster niece definition.
