No. Each person’s actual case and status matter. A qualifying L spouse may have a work benefit with appropriate evidence; a colleague’s records do not establish it.
Identify the relevant person
Shared workplace circumstances do not merge separate immigration cases. The dependent category is for a qualifying spouse or unmarried child under 21; each person needs valid status.
The spouse of an L-1 principal is treated as employment-authorized incident to L-2 status after admission, and that authorization is not limited to a particular employer, so a home bookkeeping practice serving Canadian or U.S. clients is permitted. The principal needs a valid L-1B petition based on one continuous qualifying foreign year, related active entities and special or advanced company knowledge connected to the US assignment. Agree what happens if the spouse's search runs longer than expected, and revisit the plan if the principal's employer, role or worksite changes, since the spouse's authorization ultimately rests on that status continuing. Children may generally study under the published guidance and hold no work permission through dependent status, and one who reaches twenty-one during the placement stops fitting the derivative classification entirely.