Dumbledore's Brother Bad? SPOILERS!!!!

[jeykellhyde]

No: HPFGUIDX 72399

SPOILERS!!!!!!!!
SPOILERS!!!!!!!!

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I have begun rereading OoP for the 3rd time yesterday, and I noticed 
a peculiar sentence, which I had previously overlooked. It may be 
nothing, but...I thought I'd throw it out to other HP fanatics and 
see what you all made of it.

In Chapter 9, Mad-Eye brings a photograph of the old Order and shows 
it to Harry. As he points out different people, Mad-Eye mentions 
where they are at the present day, dead or alive, etc. The sentence 
that caught my eye was, Mad-Eye says, "That's Dumbledore's brother, 
Aberforth, only time I ever met him, strange bloke." Mad-Eye never 
mentions where Aberforth is, or whatever came of him. I think, maybe, 
Aberforth was either working for Voldemort or became a Death Eater 
later on. Maybe this would explain the gleam of triumph we saw in 
Dumbledore's eyes in GoF?

I know I am going out on a WEAK branch, but I think that may be a 
possibility.