For spouses of Canadian permanent residents or citizens, Common-law Partners, Conjugal Partners and unmarried children under the age of 22.
The main point of reunification immigration is to convince the visa officer of the authenticity of the relationship and that there has been no deception of the immigration authorities in the previous reunification/immigration application.
After a successful reunification immigration, the sponsor cannot sponsor another applicant for 3 years and the sponsored person cannot sponsor another applicant for 5 years.
The Maple Leaf Card obtained by the sponsored person is an unrestricted Maple Leaf Card (the 2 year limit has been removed), and divorce or relationship breakdown after registration will not affect the Maple Leaf Card. However, the relationship cannot be broken before the registration, let alone using a fake marriage to apply for immigration.