User blog comment:Master Sima Yi/Assassinews 19-03-'14 – Two Assassin's Creeds for 2014?: Unity and Comet/@comment-1379990-20140730183153/@comment-1379990-20140731195535

Unfortunately the source did not mention which father it was. But as a guess, considering they said 'his father', I would assume that they're talking about his biological father. But again that's an assumption, so your theory could still be true. However something I have to add is that, looking back to the letters, I think other than the 'A', the letter which I thought was 'E', perhaps could be a 'C'. It's either that or the other I think. Then again if it was a 'C', I don't really have an idea what that could refer to.