foster sister ( synonym found)
Definition of foster sister:

°The daughter of one's stepfather or stepmother who is not the daughter of one's mother and is not the daughter of one's father.
°The stepdaughter of one's father or mother which is not one's half-sister.
Definition of foster sister:

°The daughter of one's stepfather or stepmother who is not the daughter of one's mother and is not the daughter of one's father.
°The stepdaughter of one's father or mother which is not one's half-sister.
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