I have a strong intuition that JR did not kill his daughter. For that matter, I have a less strong intuition that PR did not kill her daughter. Excluding those two leaves BDI and IDI. I dismiss IDI as a fantasy, which leaves only BDI. Of the four possibilities, I think BDI is the strongest one, but I have real problems accepting it. I could see BR accidentally killing his sister, either by strangling her or by the head bash. An accidental killing is what would most make sense to me, but the head bash plus the later strangulation do not point to an accident. They indicate to me intentional murder, and I just cannot see BR doing it. I admit the behavior of the parents is just what they would do if they were lying and staging to hide what their son did, but the thing that gets me is BR doing both the head bash and the strangulation. For those who believe this, can you explain in such a way as to make it make sense to myself and others. I just need to be able to understand it because currently it makes zero sense to me how that could possibly happen or why.