What actually happens for spouse and children on an EB-1A petition

Filed with a spouse and one child as derivatives, and want to share the practical shape of that, since most of what I'd read focused entirely on the principal petitioner's evidence and said little about the family side. The evidentiary case itself (the ten criteria, the personal statement, all of it) is built entirely around the principal petitioner — a derivative spouse or child doesn't need their own extraordinary-ability evidence. What they do need is their own set of supporting documentation (marriage certificate, birth certificates, and the relevant immigration forms and fees for each derivative) filed alongside or following the principal case, depending on the specific processing path. The part I underestimated: gathering and, where needed, translating and authenticating the family documentation (marriage certificate, birth certificate) took real coordination, especially since some of these documents were issued in a country with its own specific authentication requirements. I'd treat this as its own real task with its own timeline, not an afterthought tacked onto the main evidence-gathering work.