Perhaps one day, Canada can become a republic and this type of question won't clog up our courts.

But given that we're still a constitutional monarchy, it looks like a judge will be asked to rule on a Canadian law providing for gender equality at the top of the Royal pyramid.

This legislation, which was approved in 2013, ensures that the first-born child is first in line in the family regardless of whether the child is male or female.

The law reflects the will of Commonwealth countries, which were in agreement on this.

The Canadian Press has reported that University of Laval law professors Patrick Taillon and Geneviève Motard argue that this legislation amounted to a constitutional change. And that requires the support of seven provinces with at least half the population.

For their court challenge, they've reportedly obtained the support of the government of Quebec and the Canadian Royal Heritage Trust.

There are broader issues than just who becomes a future king or queen. Depending on how the case proceeds, it could have an impact on the obligations of the federal government to consult with provinces on international issues.