evidence of the parent or grandparent relationship

[cgbp]

For Visitor Visa Extension what type of documents can be provided as we don't have birth certificate, could we provide Affidavit, please confirm the documents.
Appreciate your help on this.

Below are the details of CIC

• evidence of the parent or grandparent relationship to the Canadian citizen or permanent resident you wish to visit (e.g. birth certificate, baptismal certificate or other official documents naming you as parent),