Aberforth Dumbledore?

I've been creating this little theory in my head and it involves Aberforth Dumbledore, Albus Dumbledore's brother. My question is, does Aberforth Dumbledore look like Albus in anyway, possibly a twin. Does it discribe what he looks like in one of the 6 books. If it does which book and what chapter? I can't remember exactly but I think I remember reading about him somewhere.