Should be allowed to marry their siblings?
user
Why would you want to marry your sibling?
assistant
I didn't say I would. But maybe someone has a really hot sibling and wants to marry them. Why is that bad?
user
OK, let’s say you did want to marry your sibling.  Should you be allowed to do that?
assistant
Should be allowed to marry their siblings?
user
Why would you want to marry your sibling?
assistant
I didn't say I would. But maybe someone has a really hot sibling and wants to marry them. Why is that bad?
user
I can see how this would seem attractive.  But usually incest is considered an expression of extreme trust in a family.  If you're not really close with your siblings, it seems like it would be better for a new person to become part of the family.
assistant
Should be allowed to marry their siblings?