Do not assume every relative qualifies through the principal. Have each person’s relationship, eligibility and intended activities assessed under the applicable rules.
Keep family roles separate from business roles
Qualifying L spouses are employment authorized incident to status with appropriate documentation. Children do not gain work permission solely through L dependent status. A role in the family business does not itself establish dependent eligibility or work permission.
Preparing diagrams, editing technical instructions, translating customer material, or meeting a production deadline can be productive business work even if unpaid. Dependants need evidence of the relationship to the L-1B principal and should plan around the principal's approval dates. L-1B time is capped at five years, which also affects family planning.
Confirm relationship documents, passport validity, prior status history, and the timing of each person’s travel. Parents, siblings, and other relatives outside a spouse or an unmarried child do not qualify as L dependents no matter how involved they are in the household or the business, so any relative in that position needs an entirely separate and independent immigration basis of their own. Financial dependency or a shared residence does not change that outcome. Ask an attorney early whether a relative in this position has any other qualifying category available, since waiting until travel plans firm up narrows the realistic options. Keep that relative's planning separate from the dependent filings for a spouse and children, since combining them in one conversation can obscure the fact that no dependent pathway exists for them.