Keep.
If the mother chooses to search out the parents, so be it. It is her choice. If your friend's family should stumble upon a mention of her and chase her down, it is their choice. A choice that effects two can be fairly made by one of them, but not by a third.
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-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.