A possible commercial extension does not establish an immigration extension or the family’s permissions. Review each person’s status, activities and deadlines.
Keep the legal dates visible
Qualifying L spouses are employment authorized incident to status with appropriate evidence; dependent children do not receive work permission solely through L status. Study does not extend authorized stay. Revisit household commitments when the assignment or immigration sequence changes.
Household dates and project dates drift apart quickly, so record them on one calendar. A lease, a school registration and a spouse's employment documentation each have their own renewal points, and none of them moves because a rollout is extended. Identify the earliest of those dates and work backwards from it when deciding what to commit to.
A qualifying L spouse's employment authorization runs with that spouse's status and ends with it, so a household budget assuming two incomes should be checked against the authorization's end date rather than the project's. Where the assignment may finish earlier than planned, decide in advance what happens to commitments already made; that conversation is far easier before a departure date exists than after one is set. Dependent children may study but gain no work permission, whatever the project timetable says.
Review that calendar again whenever a phase boundary moves, since one shifted date usually drags several others with it.