Correct...as he is your dependent, only list his residency as Alabama for the entire year.
His time in Illinois is considered as being there just temporarily...and he did not "Move" there.
___________________
Similarly...Thousands of students work in National parks every year over the summer, in other states. They are not considered to have "moved" to those states...and are only working there as non-residents.
___________________
And...PLEASE, get him to work on those taxes, while looking over your shoulder....every year until he is out on his own.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
