Use it for practical planning, but assess each person’s status and activities independently. A work itinerary does not establish the family’s permissions. Contrast the two dependent situations, because they are not alike. A qualifying spouse is employment authorized incident to status with appropriate documentation, while a dependent child does not gain that permission; treating the child's position as a copy of the spouse's is the error worth avoiding.
Plan work, study and travel separately
Qualifying L spouses are employment authorized incident to status with appropriate documentation; dependent children do not gain that permission solely through L status. Confirm individual requirements and authorized stays before coordinating family activities around recurring trips. Compare each family member's admission record against the principal's rather than assuming one governs the household.
Periods granted can differ, particularly where someone enters later or on a separate trip, and the expiry that matters for a given person is the one printed on that person's own record. Set the itinerary question aside from the permissions question as well: a principal away much of the month changes how the household runs, not what anyone in it may do. Where a spouse intends to work, confirm what documentation an employer will expect to see before a start date is accepted, since the practical obstacle is usually proving the status rather than holding it.