State tax filing

Online or Desktop?   It is at the bottom of the Personal Information section (My Info in TurboTax Online).   Your son's state of residence is Hawaii.  Rhode Island (if he worked and earned money there) and Massachusetts should be in the Other State Income field are nonresident states.     Do not say he lived in another state if he was just there (in RI) for education purposes.   

The Other State Income questions come AFTER all of the residency questions - but for his purposes, he only has one resident state - Hawaii.     Use the nonresident return instructions and prepare the nonresident return(s) before the resident returns.   @deanadk

Scroll all the way down to the bottom of the Personal Information Section.