You mean 'obey' right? Because if you meant 'I think he's deaf' you'd have written that differently.
Which 'everything' have you tried? Just things like bribes, threats, punishment, violence, nagging, criticizing, complaining, coercion? Or other things like 'getting down on his level and finding out what he's already doing' 'listening to what he wants and what he's trying to do' or 'setting up his environment so most of the time he can do whatever he can think of, because it's safe, child-respectful and loving'?
He's THREE. Which means he has not yet grown a pre-frontal cortex, has not got a fully-developed adult brain, has not yet left the Magical Thinking phase when reality is no different to them than dreams or imagination. Meaning: he doesn't take orders because there is a person and an opinion in there, that to HIM is no less valid than yours, and he does not (and will not for years) understand anything the way you do.
at 1:25 PM on Mar. 31, 2010