More importantly papa Raith had no motive to kill Malcolm but a lot of reasons to kill Harry. Justin had reasons to kill Malcolm but no reasons to kill Harry. What happened?
I was never arguing that a Raith killed Malcolm. I was arguing that a death certificate saying he died of an aneurism makes sense no matter who killed him. I've don't think whoever killed Malcolm is dead and defeated, so I don't think it's just Lord Raith or just Justin (unless Justin is still around).
If it was some mysterious death the coroner couldn't figure out, pick a natural cause it most looks like and go with that to hide the fact he doesn't know what's going on. The series has established that's how these things work unless you run into someone like Butters who ends up being committed and not telling the truth in an official report again.
If it was anyone trying to not kill Harry but instead use him somehow down the road, they wouldn't want anything to prompt him to question the death when he realizes one cannot trust the official records. If it was labeled "unknown" like it can be in the real world, Harry's first thought would probably be magic.
And Lord Raith may have thought he had to kill Malcolm because he couldn't let a "buck" steal his "doe." He couldn't let Arturo survive having unwittingly defied him. And that was probably a much lesser slight than "poaching" a "doe" from the king of "apex sexual predator(s)."
Het father at this point. But why would she leave Harry malive and kill the father and not the other way round.
Because she's much less of a monster than her father. Her father orders Malcolm killed for the reason I stated above. He has been assuming Harry died at birth or is oblivious to the particulars of Margaret's death. He seems the type to miss little things like this, but that might be because he's incapable of feeding when we meet him and is slowly going insane. His inattention to details would also explain why it took six years for him to order Malcolm's death.
Another possibility that hasn't been brought up is that Lord Raith and Justin were working together. They were both part of whatever scheme Margaret was a part of. Many here have theorized that that Margaret birthing a starborn was part of that scheme.