Oh jeez this is going way too far from my point of view
It's true that your brother couldn't be almost dead from a scratch above his eye, and I believe you are over reacting, which I do sometimes, but why does everyone have to get all worked up about it
And I thought you said Rupert bit your brother, not jumped on him. If he jumped on him that would be a whole nother story...
Also, if your sister was there, did she tell you the story? Your sister, being 8, could have been over reacting. Maybe the dog really was just playing, not viciously trying to kill your brother. Know what I mean?