トピ主さんと彼の分だけでいいです。
移民申請でいう「家族(family members)」とは、配偶者、コモンローパートナー、扶養義務のある子供だけで、親兄弟姉妹は含まないので。
ガイドには次のように書かれています。
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,
”Application for Permanent Residence:Federal Skilled Worker
Class,”
http://www.cic.gc.ca/english/pdf/kits/guides/EG7.pdf, p.18