I am not sure if the topic has been discussed here before, but on October 28, 2019, the Quebec Court of Appeal finally ruled to
dismiss the appeal by Geneviève Motard and Patrick Taillon against the previous decision of the Quebec Superior Court that upheld the validity of Canada's Succession to the Throne Act, 2013. The full text of the Court's ruling can be found
here . Unfortunately it is in French (I couldn't find the English translation).
Just to give some context, the Succession to the Throne Act was passed by the federal Parliament of Canada to assent to the UK's Succession to the Crown Act, 2013 in accordance with the requirement set out in the preamble to the Statute of Westminster, 1931. The plaintiffs, who are two law professors from the University of Laval, challenged the legislation in the Quebec courts on the basis that it did not comply with Section 41(a) of the Constitution Act, 1982 under which any change to the constitution of Canada affecting "the office of the Queen" also requires resolutions from the Legislative Assemblies of all provinces of Canada. Furthermore, the plaintiffs also claimed that the Succession to the Throne Act violated Section 2(a) of the Canadian Charter of Rights and Freedoms by assenting to the exclusion of Roman Catholics from the line of succession.
If I understand it correctly, what the Superior Court found, and was upheld on appeal by the Court of Appeal, is that:
1. The British laws of succession are
not part of the constitution of Canada and apply to Canada solely by the principle of symmetry implied in the preamble to the Constitution Act, 1867, under which the person who occupies the throne of the United Kingdom is also the King or Queen of Canada. There is therefore no need to resort to the amendment procedure in Part V of the Constitution Act , 1982 to give assent to the amendment in British law to the British rules of succession. The enactment of a statute of assent by the Canadian Parliament such as the one passed in 2013 (again in accordance with the Statute of Westminster) was sufficient.
2. Section 41(a) in the Constitution Act, 1982 protects the institution of the monarchy, but not the procedural rules that allow a person to accede to the throne. The Succession to the Throne Act, 2013 makes no change to the powers, status or constitutional role vested in the Queen of Canada and therefore does not fall within the meaning of the “office of the Queen” as envisaged in Section 41(a).
3. Neither the Canadian Succession to the Throne Act, 2013 nor the unwritten principle of symmetry regarding the hereditary succession to the thrones of the United Kingdom and Canada incorporate the British sucession laws into Canadian domestic law. Since the Canadian Charter of Rights and Freedoms does not apply to British laws, the challenge to the 2013 act based on incompatibility with the Charter is also dismissed.
Finally, the Court of Appeal also rejected another claim by the plaintiffs of an alleged violation of s. 133 of the Constitution Act, 1867, which provides that legislation must be enacted in both English and French. Again, since the UK law of succession is not part of Canadian domestic law, the Court ruled that Section 133 did not apply in this case.