The official page describes additional fees and gifts for each accompanying spouse and unmarried child under 21. Each person is examined for admissibility separately, and a child who reaches 21 before residence is granted may fall outside the household application.
Every family member is a separate line of cost and eligibility
A Boischatel household reading the headline figure should immediately rebuild it for the actual number of people who would accompany the principal, because the official description attaches its own processing fee and gift to each spouse and eligible child. Beyond cost, each family member is vetted individually, so a spouse's prior immigration history or a child's medical record is its own admissibility question. Hypothetical example: a physiotherapy clinic owner in Boischatel with a spouse and two children, one aged twenty, needs to ask what happens if the older child turns 21 before residence is granted, whether any payment made for that child is affected, and whether the program applies any age-protection rule.
The official materials should be checked for those answers rather than assumed. Compare that treatment with EB-5, where derivatives are included without additional investment, and with employment routes where dependants have their own status rules, before deciding the framework fits the family.