step brother ( synonym found)
Definition of step brother:

°The son of one's stepfather or stepmother who is not the son of one's mother and is not the son of one's father.
°The stepson of one's father or mother which is not one's half-brother.
Definition of step brother:

°The son of one's stepfather or stepmother who is not the son of one's mother and is not the son of one's father.
°The stepson of one's father or mother which is not one's half-brother.
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