Deductions & credits

Ok so a question or two.

 

If Joey selects at the beginning they can't be claimed as a dependent, he gets to a screen for the EIC and he sees the, "I can be claimed as a qualifying child by someone else."

 

Is it legal and possible for him to select he can't be claimed as a dependent and then select he can be claimed as a qualifying child so he doesn't get the EIC and then on my taxes, I don't claim him as a dependent, but I claim the EIC because he's disabled and lived with me all year?

 

It's all rather confusing and I just want to make sure we are filling this out right so neither of us get audited.

 

Am I understand it right? That's where the EIC/non dependent credit comes in right?