Tsukihime Chapter 36 Discussion

I think it was probably actually a step-brother (still needs the Tohno bloodline) ... It would appear that the other kid was the insane one first, but what the fuck is up with his sister? If he regains his memories is his sister going to kill him? Can there only be one person with the Tohno bloodline per generation? Cause why have more than 1 kid if that is going to be the case?

As far as I got it they maybe adopted someone who should take his place because he got weak? But maybe I am wrong :S

Even so, adopted is not a pure bloodline how can this be that they both got this demon sort of thing?

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                        Oh. Ah. Holy shit what revelations!!

Nice to see Shiki's past develloped briefly, he had an adopted brother, wtf?! He was already killed, lolwut??!