After you file

Sorry.  Did you efile them?  When the IRS starts accepting returns Jan 27 or 29 the second one filed will reject.  Then if the other return is Accepted you will have to wait for the IRS to fully process it and you get the first refund (or pay the tax due).  THEN  you can Amend it to add the other person's income.  Or did you include both your incomes on both returns?  Then it should be ok  since the IRS will only accept 1 return.   Hope that makes sense.