You son will have to amend his tax return, to indicate that he is being claimed as a dependent on your return.
In the meantime, you won't be able to e-file your return claiming your son as a dependent. You can:
How old was your son at the end of 2016? Was he a full-time college student? Did he earn more than $4050 in 2016?
HE WAS 19YR OLD. YES HE IS A FULL-TIME STUDENT.NO HE DID NOT EARN MORE THAN $4050.
You should claim him as your dependent. See the answer below form TurboTaxIrlene. You son has to file an amended return to correct the answer he gave in Personal Info claiming himself and say that he can be claimed on someone else's return. Your own return CANNOT be e-filed this year now. You have to print, sign, and mail your return.
You son will have to amend his tax return, to indicate that he is being claimed as a dependent on your return.
In the meantime, you won't be able to e-file your return claiming your son as a dependent. You can: