The spouse’s individual status and documentation determine the relevant permissions. The company’s promotion decision does not authorize family employment. What changes a spouse's position is the spouse's own status and the evidence of it, not the seniority of the principal's new title. A larger role does not widen a dependant's permissions, and a household that plans around the promotion rather than around each person's status tends to discover the gap only after arrival.
Include the household’s own plans
Qualifying L spouses are employment authorized incident to status with appropriate evidence; children do not gain work permission solely through L dependent status. Discuss study and work separately and confirm authorized stays before relying on a relocation date. The failure is a household that treats one approval as covering four people.
Each dependant needs a valid travel document of their own, a record of their own admission and, where a spouse intends to work, evidence of employment authorization incident to that spouse's status. Schools ask for the child's documents, not the parent's approval notice. Sequence it deliberately: confirm the principal's status first, since a dependant's position derives from it and cannot be settled earlier; assemble each person's papers next; commit to a school year or a resignation last.
Reversing that order is what produces a spouse who has already resigned in Canada and cannot yet accept work.