Plan the household around the principal's outcome rather than the supplier's calendar. An eligible legally married spouse and unmarried children under 21 may seek to accompany, but each person has their own process and eligibility, and no shared date is guaranteed. A qualifying E spouse is generally employment-authorized incident to valid status; dependent children are not.
Keep household income separate from the renegotiation
If the family budget assumes the spouse earning quickly, confirm how that employment authorization would be evidenced — the E-2S notation, the I-94 record, or other applicable proof — and remember that residence or an employer's willingness to pay does not authorize work. Delay caused by contract redrafting can push school enrolment and lease dates. Decide now which family members travel first and which commitments can wait.
Household planning here is a documents exercise more than a calendar exercise. List each person, the document that will evidence their status, and who issues it, then mark which of those documents does not yet exist. A spouse's ability to work is generally incident to valid status and is evidenced by that person's own record, so the household budget should not treat the income as available until the record itself is in hand.
A child's authorised stay is recorded separately again. Where the enterprise's launch date is uncertain, decide in advance which family commitments can be reversed at no cost and which cannot. Hypothetical example: an engineer budgets a household move around a spouse's expected earnings, and the plan is rebuilt once it becomes clear which record must exist before that work may begin.