Only if he was a U.S. citizen, U.S. national, or U.S. resident alien (being a resident of Canada or Mexico does not qualify)
You can actually amend all the way back to 2013.
You find the instructions on how to amend all of those years in the directions below. Just go into the amendment and add him to the Personal Info section. Just remember to answer all the questions in that section.
https://ttlc.intuit.com/replies/3288565
