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The ethics surrounding the rights of children to know if they were adopted, or conceived in some non-natural way, have had a large airing. But, by some estimates, in some communities, one in five children are not the child of their putative father. Why are there no ethical pronouncements about this? If an adopted (or IVF-conceived) child can have the "right" to know about their origins, how does this differ from any child having the same "right"?