Her spouse and unmarried children under 21 receive the same two-year conditional status as derivatives, may work and study without further authorization, and must have conditions removed with her. A child's age is assessed under the Child Status Protection Act, not frozen by the investment.
The dates to circle
Conditional residence gives the whole family the rights of permanent residents for two years: the spouse may work anywhere, children may study, and no separate authorization is needed. It is nonetheless conditional, and the removal-of-conditions petition filed in the ninety days before the second anniversary determines whether the status becomes permanent for everyone. The child-age question comes first in time: CSPA may subtract the pending time of the investor petition from a child's age in some circumstances, but the result depends on the petition's timeline and on visa availability, so a child who is twenty at filing may or may not remain a child by the time a visa is available.
Ask counsel to run the calculation with the real birth dates and to advise whether filing sooner protects anyone. Record each family member's citizenship and Canadian status because consular processing will require civil documents for each. A family that plans schooling around conditional status should also plan for the possibility that the clinic's hiring slips and the removal petition is contested.