主人がカレッジに留学することになったのですが、私と子供（未就学児）はあとから合流するか、日本に残るか決めかねています。その場合、主人のビザを申請する際、家族はカナダへ一緒に行くかYes or No を答える質問の欄があるのですが、どのように書くべきですか？もしYes を答えた場合、一緒にビジタービザを申請する必要があるのですか？どなたかご存知の方いらっしゃいますか？ぜひ教えて下さい。よろしくお願いします。

サイト上に載っていました。更に詳しい情報は、カナダ大使館/領事館でお尋ねされた方が良いと思います。

【May my spouse or common law partner and dependent children accompany me to Canada?】

Yes. They may either accompany you to Canada or they may join you at a later date.

Your spouse or common-law partner and children must meet all the requirements for temporary residents in Canada. They must satisfy an officer that they are genuine temporary residents who will be in Canada for a temporary stay. They may be required to provide evidence that they are law abiding and have no criminal record. If your family member applies for a temporary resident visa, they must also meet all the conditions to obtain a visa.

Include them on your application by providing their names and other information in the appropriate space on the application form.

Important: You may be required to provide a marriage certificate and birth certificates for any accompanying family members. If you are in a common-law relationship and your common-law partner will accompany you to Canada, you may be required to complete the enclosed form Statutory Declaration of Common-Law Union (IMM 5409). Also provide evidence outlined on the form to support your relationship.

If your family members wish to follow you to Canada at a later date, they must make a separate application for admission.

http://www.cic.gc.ca/english/information/applications/guides/5269E2.asp 　

ありがとうございます。とても参考になりました。