移民申請上の家族の定義に親兄弟は含まれません。
配偶者と扶養義務のある子供のみです。
http://www.cic.gc.ca/english/applications/guides/3999E.html#wp1039392
Persons who should be included in the application
If you are being sponsored as a member of the family class, your spouse or common-law partner (except where your spouse or common-law partner is the sponsor) must be included in your application as a family member. You must also include all your dependent children from your current and previous relationships, whether they will be going with you to Canada (accompanying family members) or not (non-accompanying family members).