You do NOT put his income on your return and he does not need to file a return but if he does it is just to get back the $6 withheld ... he MUST put he is being claimed as a dependent so do NOT let him file before you do incase he makes a mistake.
He can used the FREE FILE program here :
https://ttlc.intuit.com/questions/1900583-what-is-turbotax-free-file-program
