官网的这个链接说“非直系亲属必须填写一个法定声明表格IMM0006”:
What to do to unite with your extended family member
Step 1: Your family member fills out the application for authorization and statutory declaration form
Your family member who is the Canadian citizen, person registered under Canada’s Indian Act or permanent resident must fill out the application for authorization and statutory declaration (IMM 0006) (PDF, 2.2 MB). Updated November, 2020
Step 2: You sign the declaration
Your family member in Canada sends you the filled out application for authorization and statutory declaration (IMM 0006) (PDF, 2.2 MB) Updated November, 2020 for you to sign. After you sign the form, you send it back to your family member in Canada. You can print the form and sign it or sign it electronically.
Step 3: Your family member signs the form by solemn declaration
Once you’ve sent the form back to your family member in Canada, they must sign the form by solemn declaration. This is done in front of any official who is legally authorized to receive a solemn declaration, such as a commissioner for oaths, justice of the peace, lawyer or notary public.
If your family member is outside Canada
If your family member is outside Canada and can’t sign the form by solemn declaration in person, there are Canadian service providers, such as some notaries public, commissioners of oaths and lawyers, who may offer this service online.
Your family member may also be able to sign the form by solemn declaration in front of a consular officer of the Government of Canada. They should contact the nearest Government of Canada office overseas to ask about this option. However, in some countries, Canadian consular officers may not be able to perform the solemn declaration due to COVID-19. Your best option may be to find a designated Canadian service provider.
Step 4: Get a copy of the completed and signed form
Your family member in Canada must send you a copy of the completed and signed application for authorization and statutory declaration (IMM 0006) (PDF, 2.2 MB). Updated November, 2020
Step 5: Request written authorization to travel
When requesting a written authorization, you need to provide a copy of the completed and signed application for authorization and statutory declaration (IMM 0006) (PDF, 2.2 MB) Updated November, 2020 to use as evidence of your relationship with your family member and request a written authorization from us.
You also need to provide proof that your extended family member is a Canadian citizen, person registered under Canada’s Indian Act or permanent resident. For example, you can provide a copy of their
Canadian birth certificate
Canadian passport
secure certificate of Indian status or certificate of Indian status
TCRD
permanent resident card or permanent resident travel document
Make sure you email us all required information, including the completed and signed statutory declaration, in one email only. If you send us multiple emails with different information, your request will be delayed and may be refused.
You need written authorization from us, whether you’re travelling from the United States (US) or any other country.
How you request a written authorization depends on whether or not you already have a valid travel document (visitor visa or eTA).
COVID-19 border measures have ended as of October 1, 2022 for all travellers entering or returning to Canada by air, land or sea.
www.canada.ca