If you provided over half of his support, you can claim him as your dependent.
However, in your question you say your son 'claimed himself as a dependent'. If he indicated he is a dependent on his tax return, then you can still claim him and Efile.
If he did not indicate that he is a dependent on his tax return, you will need to print and mail your tax return as your Efile will reject.
Here's more info on What does Financially Support Mean?
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