Plan for it. The child's independent options are separate work with their own professional fees and government charges, and treating them as an extension of the investor's case tends to produce a surprise later. Ask for a scope and estimate covering that review specifically, and confirm official fees at the time each step is taken.
Keep education money out of the investment figure
Tuition, deposits, testing and insurance for the children are household expenditure. They are not capital placed at risk in the enterprise, and describing them that way would misstate the investment. Budget them separately, alongside the family's living costs and the professional fees for both immigration matters.
Then check what the enterprise still needs: reducing the business's working capital to cover a school bill weakens the case the family is trying to build. Hypothetical example: a family acquiring a car wash chain budgets the investment, the professional fees and the relocation, and discovers eighteen months later that the eldest child's separate matter was never costed. A first review would have listed both matters at the outset, with a professional estimate against each, and would have identified which of the two has a deadline.
It would also have kept tuition, deposits and insurance out of the investment figure entirely, since those are household expenditure and describing them otherwise would misstate what the enterprise actually received.