User blog comment:Master Sima Yi/Assassinews 19-03-'14 – Two Assassin's Creeds for 2014?: Unity and Comet/@comment-1379990-20140730183153/@comment-2.124.213.31-20140801182429

Got to be clear on the distinction. Half-Sister or adopted sister?

Half-sister sister is a blood relative. Adopted-sister is not: while it may be frowned upon, there is no bloody tie for it to be incest.