Keep relevant dated records to explain the history, while identifying current instructions for action. Do not present an old version as current or delete evidence of what was previously relied on.
Maintain a dated source record
Save the official source and relevant correspondence with clear dates. Identify whether a document is a general page, payment instruction or individual notice. Ask counsel or the official channel how an apparent conflict affects the actual case. Do not infer that every website change applies retroactively or that none can matter.
The official process describes an application and fee, further USCIS instructions and supporting documents, vetting, and the subsequent gift once instructed, and the applicant still needs to be eligible for lawful permanent residence, admissible, and have an available visa. The vetting file is personal: passports, civil records for the marriage and the children, addresses and travel history, and a frank account of anything in a person's background that might bear on admissibility, disclosed to an attorney early rather than discovered later. Alongside the funds narrative, expect the ordinary civil record to be requested: birth, marriage and any divorce or death certificates, police records from countries of long residence, and identity documents in every name the applicant has used.