http://www.cic.gc.ca/english/resources/manuals/fw/fw01-eng.pdf - page 38 said:
Applications from spouses/dependent childrenFW 1 Temporary Foreign Worker Guidelines
Applicants may wish to have their spouses and dependent children accompany them to Canada.. In these cases, the officer should consider the applications as a single unit, rather than assessing each separate from the others.
The applicant’s spouse is not eligible for an open work permit and requires an LMO if applying for a work permit. Also, as temporary residents, any children may be required to pay international student rates to attend school. These costs, as well as the cost of travel to Canada, health coverage and family accommodations, may have to be borne by the applicant since the employer, under the LSP, is obliged to provide these only for the applicant. The onus is on the applicant to demonstrate to the officer that they are capable of meeting these expenses.