genetic inheritance

I was fascinated by this item on the BBC new site today. Quite amazing how strong the instinct about our genetic origins is. Not only did both father and son sense the mistake that had been made, despite there apparently being no evidence other than their own intuition for the swap having happened. Also, the sister became convinced by the appearance of the young stranger of her lost brother's relationship, to the point where she initiated conversation that led to the uncovering of the mistake.
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