You can still file it. The instructions below come from the IRS. If you e-file, you will only need to sign the 8879 form per the same instructions. You don't need to mail in the form or attach a statement, but would do so if the IRS asks for it. Please note:
If you file a joint return, both spouses must sign the return. If your spouse cannot sign because of a medical condition and requests that you sign the return, sign your spouse's name in the proper place, followed by the word "by" then your signature, followed by the word "husband" or "wife." Be sure to also sign in the regular space provided for your signature. Attach a statement that includes the form number of the return you're filing, the tax year, the reason your spouse cannot sign the return, and that your spouse has agreed to your signing for him or her. If you're the guardian for your spouse who is mentally incompetent, you may sign the return for your spouse as "guardian."
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