I think Chantal Desloges spoke about this earlier. I agree that it was an administrative nightmare for Immigration to decide which child was in reality a student or was just in school so that they could be included in an application as a dependant. I also agree that the cut-off age of 19 is too low for families, because kids are in school at that age and most of the children need the support of the parents to continue to be in school.
Perhaps—and this is something that I'm just thinking about right now—rather than raising it to 22, maybe we can raise it to 24. You could suggest raising it to 24, so that automatically would include the dependants who are in school.