If he already filed his return and indicated on it that someone else can claim him as a dependent, all he needs to do is to file an amended return to change that information. On your return, you would not claim him as a dependent. If you already filed your return you will need
to wait to see if it was rejected or accepted. If they were rejected you are
able to login to your return add the missing W-2, fix the errors that caused
the rejection and refile the return. If your returns were accepted, then you will
need to file an amended return.
You should not try to amend your return until the
original return it has been fully processed and you have received your refund
or your payment has cleared.Amended returns do not “catch up” to your original return and replace them;
they are processed as two separate returns.
Amended returns have to be printed and filed by mail. It can take the IRS
up to 12 weeks or longer to process them. If you are due a larger refund
than on your original return, your amended return should only show the
difference and you will receive a separate check for it. If you owe money
on your amended return, it will show only the new amount owed, you will have to
mail a check with the return. Click here for amending instructions:
https://ttlc.intuit.com/replies/3288565
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