The data from the census are top-quality. We have data on the language spoken the most at home, but also on the other languages spoken regularly. I believe that this allows us to have a more accurate portrait of the situation.
We have seen that in minority situations, the rate of exogamy is growing. Exogamy is where people with different mother tongues become a couple and live together. We know that in that environment, the majority language tends to be adopted as the main language used at home. The data on the language spoken regularly at home allows us to complete the overall portrait to see to what extent French in a minority community continues to be used within a household.