No, she is not related to you as she is from a different father and mother.

Her daughter is also not related to you.

Is your sister’s sister your mahram? My sister and I have the same mother her sister and she have the sane father. What about your sister niece?

Women clothing | March 21, 2014 11:59 am
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I had a question pertaining to makeup. Is it permissible for a sister to put foundation on her face to cover up blemishes? An application where you can’t tell shes wearing makeup.Or is it all the same?
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Is it permissible in islam for a lady who you yet to pay her dowry but her family already known that she your wife to cook for you during Ramadan?