So the this that he is under it is possessing him and making him remember the past deaths and the future deaths of his parents. He thinks the person that killed his mother is his dad so now he is getting ready to avenge his mom and kill his dad. The mark on his face is something that the thing that possessed him gave him. I think that may answer some of ur questions that you might have, but if u still have more questions ill always be free to answer. :)