Hi Bunny03,
either of you can filled up the DS-260(CEAC) as long as you have the NVC Case Number and Invoice I.D. number to log-in . that's what my daughter do. She is in Philippines this time to get his 4 year old son. during their interview with his son the consul reschedule their interview for she don't have the DS-260. She log-in in CEAC website using the case number and Invoice I.D. Number. then she click the edit/view and in the left side she click the get started for his son information. After she submit it, NVC send the confirmation letter and she print it right away... Now my grandson visa was approved.. they are now in Davao City waiting for the visa to delivered...
Good Luck...