I accidentally files my son (16 years old) tax return without declare he as my dependent. This is made my tax return was reject when I did e-files.

I accidentally files my son (16 years old) tax return without declare he as my dependent ( now my son already received his refund from the federal withheld). This is made my tax return was reject when I did e-files. I know I have to amend my son tax return, so I would give recommend about my tax return if I have to wait until my son amend completed or not, that mean it will take to long around 16 more week and I am worry that will make me could not files my tax return on the deadline. Please recommend me about this. Which the best way can I fix it. Thank you so much.