A mamzer is from a relationship that is forbidden between a man and someone else’s wife. I am not 100% sure about the child of incest, but I would think it includes that as well. A child born to a man and a woman who would otherwise be permitted to him, is NOT a mamzer, even if they did not get married. If he is married, but the woman is not, the child is not a mamzer (but the father sure is, in my book!).
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