It depends on the immigration status of your family members. If your family members are temporary residents (visitors), they have to apply for a work permit to be able to work.
Your family members can apply for a work permit from within Canada if they are in 1 of the following situations:
They’re in Canada and eligible for an open work permit for sponsored spouses, common-law partners, conjugal partners and their accompanying dependent children.
They’re eligible to apply for a work permit supported by a labour market impact assessment (LMIA), which is an authorization from Employment and Social Development Canada that an employer needs in order to hire a foreign worker.
They’re eligible to apply for a work permit based on an exemption from the LMIA process.
Find out how to apply for a work permit.