what do i call the daughters (unadopted by my brother) of my brother's 2nd wife?
who are they to my (and my brother's) parents?
They are your brother's stepdaughters; they are your step-nieces (but this is not a very common word); they are your parents' stepgranddaughters (again, not a common word).
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They are your brother's stepdaughters; they are your step-nieces (but this is not a very common word); they are your parents' stepgranddaughters (again, not a common word).