A spouse admitted in L-2 status is employment-authorized incident to that status, so no separate permit is needed before taking a job, working independently or starting a business. Unmarried children under twenty-one may enter in L-2 status and attend school, but they may not work.
Broad rights, entirely borrowed from the principal
Of the routes described on this site, L-1 treats an accompanying spouse most generously, and employers ordinarily rely on the annotated Form I-94 issued on admission when completing onboarding paperwork. The spouse's nationality does not affect eligibility for L-2, so a partner who holds Canadian permanent residence rather than citizenship is not disadvantaged except in whether a visa is needed before travel. Three limits deserve attention in a case like this one.
Every dependent status is derived from Cormac's, so if the group disposes of the American company or he leaves the organization, the family's status ends and any employment his spouse holds must stop with it. A child who will pass twenty-one during the assignment needs an independent plan arranged well before the birthday. And the marriage must be legally valid, since a common-law relationship does not create a spouse for these purposes.