Hi thaenraj,
If the return has been filed, your son will need to file by mail. In addition, he may want to include a note in his return that he was claimed by you. Since you have already filed, it is advisable that you prepare an amended return that removes your son from the return. Be mindful that this could cause you to owe additional taxes up to $500.
It is not clear how old the eldest son is or if he is in college. That being the case,
1. If not in school and over 18, the steps above will be correct.
2. If age18 or less, your return could be correct and your son may pay added taxes due to being a dependent.
Goodluck to you!
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