Program payments come to US$4,060,000: four nonrefundable processing fees of US$15,000 each, and four gifts of US$1 million each paid after successful vetting. Excluded are visa costs, medical examinations, legal fees, translations, travel, schooling, housing, and tax advice. None of the US$4 million is equity, and no refund is promised.
Model the household after the payments
The useful test is not whether the family can reach US$4,060,000 but what its finances look like the day after. Model remaining income, U.S. housing costs, and school or university fees, then add the tax picture: permanent residents are taxed on worldwide income under ordinary rules, so a qualified tax adviser should review the family's assets before the move rather than during the first filing season.
Add one further exercise to that model. Run the household's finances on the assumption that the process does not complete: the processing fees for every included person are spent, no larger payment is ever instructed, and the family remains where it is. If that scenario is survivable, the plan is robust; if it is not, the plan depends on an outcome nobody can promise.
Then run the opposite scenario and check what changes about existing assets, since permanent residence brings ordinary U.S. treatment of worldwide income and the timing of any planned sale may matter. Hypothetical example: a family models both versions on one page and discovers that a planned transfer of a business interest is straightforward under one and considerably more complicated under the other, which is worth knowing before either happens.