Your knowledge does not itself establish the spouse’s permission to perform US work.
Confirm the spouse’s actual work authorization
Qualifying L spouses may work incident to appropriate status with required evidence, while children do not receive those spouse rights. Assess the actual activity and status before an accompanying family member joins the installation team.
Do not treat shared household knowledge as work authorization. Determine exactly what the spouse would do, where the services occur, who directs them, and whether compensation or business benefit is involved. Proper L-2S spousal documentation supports work incident to status; L-2 children lack employment permission, and neither derives specialized-knowledge authority from the principal. The principal’s L-1B case separately needs one continuous qualifying year abroad in the relevant three-year window, a qualifying related organization, and company-specific specialized knowledge required by the US assignment. If installations occur at an unaffiliated customer, employer control must remain real and the placement cannot be labour-for-hire. Track the principal’s five-year maximum. A shortcut is calling productive assistance “family help” before verifying status.
Hypothetical example: A Saint-Ambroise packaging-line installer is accompanied by her spouse, an electrician, who offers to connect panels during a rushed deployment. He does not touch the equipment until his L-2 spousal classification is properly shown and the hiring company completes its own employment steps. Their child may observe a demonstration but cannot join the paid crew. Meanwhile, her petition explains the employer-specific calibration sequence and control over the customer-site assignment rather than relying on her family’s technical abilities.