How does the Government define "immediate family member" under the COVID-19 restrictions?

In the Interim Order to Prevent Certain Persons from Boarding Flights to Canada due to COVID-19, immediate family member, in respect of a person, means

• (a) the spouse or common-law partner of the person

• (b) a dependent child of the person or of the person’s spouse or common-law partner

• (c) a dependent child of a dependent child referred to in paragraph (b)

• (d) the parent or step-parent of the person or of the person’s spouse or common-law partner

• (e) the guardian or tutor of the person