Most of us, myself included, have an automatic knee-erk reaction of disgust towards incest. For many people, that seems to be enough basis to declare something right or wrong and therefore organise sweeping social and legal consequences. Not an attitude I can understand, I need a little more substance to back my moral stances.
The fact is, I can't fathom any way a sibling relationship can harm anyone. If it is the product or cause of some deeper problem that is affecting their social and mental health, then action should be taken, but for those reasons rather than the incest itself. There is a difference between a loving if incestuous relationship, and abuse. Children should really be avoided, though. Parent-offspring relationships are a different matter. There is far greater scope for abuse, harm and paedophilia, and the risks for any children are also greater.
Basically, under the "right" circumstances, I would willingly tolerate it, though I don't advise it.
That said, we might have different opinions if we consider it in the context of our own future children. That would be a bit of a dilemma, make no mistake.
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