I'll review the DS-260, but I included their US birth certificates as evidence and don't think I added them as derivative. On the children section I did answer "yes" to the question "is this child immigrating to the US with you". But they have accepted the DS-260 and I can;t amend that now, maybe I should have answered "no" as they are US citizens.
They also rejected my birth certificate, my military records, and also wanted a 2024 1099/schedule for my sponsor who is self employed (although they have accepted his AOS and all documents within, which include every schedule he has, and he doesn't receive any 1099 which we explained in a cover letter),
Frustrating time.