Question about attacking from brush

I'm trying to understand how visibility works when you attack from brush. I'd appreciate if anyone could bring an answer to my questions. 1) I've read that only point-and-click abilities and AA's will reveal you, so skill shots won't make you visible. Is this true? 2) Let's say you AA from brush and become visible. For how long do you stay visible? Forever until you leave brush and go back in it? Or is there a timer for becoming invisible again? 3) Let's say you and an ally both hide in brush. Your ally initiates an AA, do you become visible too?
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