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First-sister: woman with the same mother.
First-brother: man with the same mother.
Near-sister/brother: friend who is as close as a first-sister/brother.
Second-sister: woman who is your mother's niece.
Father-sister: woman who is your father's niece; this is not as close a bond
Sister-wife: woman who shares your husband.
Second-mother: your mother-in-law.
Sister-mother and sister-father: aunt and uncle on your mother's side.
Greatmother and greatfather: your mother's parents.
Second greatfather and second greatmother: your father's parents.