[just another ref]

Originally Posted by potato

Actually you are spot on on what i meant.

So in short within a dribble, a ball cannot touch both hands whether same time or different and no matter how light the touch was even if it's just the fingernails?

As stated above (more than once) the touch with both hands ends the dribble. If the ball is subsequently pushed to the floor, not fumbled, this is the start of another dribble and a violation.

What if the ball handler was trying to protect the ball from a reach in attempt and the defender happens to bump his off ball hand into the ball, and he continues to dribble, would you call it a double dribble or would you see it as unintentional? Since you guys usually don't call for illegal contacts on incidental contacts.

Intent has no bearing on a violation. Contact is illegal or incidental. It cannot be both. It can be either one, regardless of intent.

And also would you see the dribble has ended if the dribbler the ball was accidentally caught between his hand & waist for a very brief moment, doesn't look like a hold but contact between hand/ball/waist.

This is a judgment call. If, in the official's opinion, it "doesn't look like a hold" play on.