Family members include your:
Spouse: A husband or wife of the opposite sex
Common-law partner: A person of the opposite or same sex with whom you have lived in a conjugal relationship for at least one year
Dependent children: Daughters and sons, including children adopted before the age of 18, who:
- are under the age of 22 and do not have a spouse or common-law partner;
- have been continuously enrolled as full-time students and financially supported by their parents since turning 22 (or from the date of becoming a spouse or common-law partner if this happened before the age of 22); or
-have substantially depended on the financial support of their parents since before turning 22 and are unable to support themselves due to a medical condition.
http://www.cic.gc.ca/english/applications/guides/EG79.html#wp613443