User blog comment:Master Sima Yi/Assassinews 19-03-'14 – Two Assassin's Creeds for 2014?: Unity and Comet/@comment-1379990-20140730183153/@comment-2.124.213.31-20140801202445

"Even among step and adopted siblings, it is considered incest. It's not exclusive to people related by blood."

That was your statement. And that statement, as I just shown, was incorrect. Step-sibling is not to different from adoptive-sibling and has the same application really. (Admittedly, I did see the "step" in your post before now)