Consider staging arrivals. Each family member needs their own process and eligibility, and no shared date is guaranteed for anyone. If a spouse's employment supports the household, that depends on holding qualifying E spouse status and being able to evidence it, not on arriving early or on the business having a signed lease.
Match school and housing to unresolved facts
A legally married spouse and unmarried children under 21 may accompany the principal, and employees admitted in E-2 can have dependents too. Employment authorization for eligible E spouses generally comes with that status; check the I-94 class of admission or an E-2S annotation before work begins. Children hold no work authorization through dependent status. Where the premises are unsettled, avoid signing a long residential lease near an address that may change.
Families running a small business together assume the household shares one permission, and it does not. Compare housing and schooling obligations with a conservative income scenario tailored to the household. A treaty investor status is renewable, potentially for many years, and the spouse is employment-authorized incident to that status, which makes it attractive to families. A spouse's employment documentation is a separate question from the investor's ability to operate the enterprise.