On the published individual terms, a nonrefundable US$15,000 processing fee for each of the four, so US$60,000, and after successful vetting a US$1 million gift for the principal plus a further US$1 million for each joining spouse or unmarried child under 21. Every figure should be re-verified officially before payment.
Do the arithmetic per person, because nothing here is priced per household
The per-person structure is what makes a family calculation so different from an individual one, and it is the point at which many people stop treating the route as realistic. Marielle should set the numbers out as a table with two columns, one for the nonrefundable stage and one for the stage that follows successful vetting, and should note beside each figure the date she read it on the official page. Beyond the published amounts sit costs the framework does not mention: legal advice on the underlying category, any State Department and medical charges that apply at the immigrant visa stage, translation, and the professional time involved in assembling a record.
None of that is refundable either. The corporate figure of US$2 million per sponsored employee applies where a company pays, which is a different arrangement with its own terms and is not an alternative price for the same thing.