u have to show that ur mother and ur cousin mother have common parents by birth certificates
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see guide factor 6
E. Relatives in Canada:
You or your accompanying spouse or common-law partner has a relative, i.e. parent, grandparent, child, grandchild, child of a parent, (sibling), child of a grandparent, (aunt/uncle), or grandchild of a parent, (niece or nephew), who lives in Canada and is a Canadian citizen or permanent resident.