Traditional Culture Encyclopedia - Hotel reservation - What is the relationship between brother and daughter-in-law?

What is the relationship between brother and daughter-in-law?

Brother's daughter-in-law is called brother's daughter-in-law: sister-in-law. My brother's daughter-in-law calls my brother's daughter-in-law: eldest sister-in-law. The relationship between them is sister-in-law

Their relationship: sister-in-law. Brother's daughter-in-law is called brother's daughter-in-law: sister-in-law. My brother's daughter-in-law calls my brother's daughter-in-law: eldest sister-in-law.