First, we must eliminate child abuse and rape from the picture. As long as they avoid having children. Kids can't consent, and rape is rape. We are talking here about consensual incest where both parties are legally adults. I don't condone sexual abuse of children, but consenting relations between adults should be a matter of choice.
If they consent to it and they are adults, so why should anybody besides themselves have anything to say in the matter? They are not hurting anybody by just having sex with each other, No one is being harmed or doing anything they don't want or desire. If Mutual Desire is apparent then - with necessary precautions to prevent pregnancy.
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