I may be reading this wrong, but wouldn't it depend on how much the income is divided between his job and his unemployment benefits?
If unemployment benefits are greater than $1,100.00, he would need to file a tax return, reference this support article:
https://ttlc.intuit.com/community/children-dependents/help/do-i-need-to-file-my-own-taxes-if-i-m-a-d...
Hope it helps,
-Tim
