can a canadian passport be used as proof of citizenship
Documents other than those listed above, including Canadian passports, are not considered as proof of citizenship, but a passport is issued only after review of other documentary proof, as noted above. Church-issued baptismal certificates and birth certificates issued by an authority other than a provincial or territorial government are also not proof of Canadian citizenship. Such certificates were common in Quebec, as the provincial government did not start to issue birth certificates until 1994.
Canadian nationality law