husband, wife, father, mother, son, daughter, brother, sister, sibling, offspring, ancestor, spouse, uncle, aunt, nephew, niece, cousin, father-in-law, mother-in-law, son-in-law, daughter-in-law, brother-in-law, sister-in-law, grandfather, grandmother, grandson, granddaughter, etc. I'd say: your sister's husband's brother = your brother-in-law or, more specifically, your sister's brother-in-law or your brother-in-law's brother. your sister's husband = your brother-in-law Add "-in-law" whenever you cross a marriage line.
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Swiss JakeThanks CJ,
so, my brother-in-law's brother's daughter is : Your sister's niece, via her marriage t