Family doctors in Canada go through four years of medical school and two years of residency training for their specialty. They have extremely limited exposure to any sort of education around oncology, and breast cancer is no exception. At the University of Ottawa, they get about one week of oncology lectures in their time during medical school, and there is no mandatory training in oncology.
The real biggest issue with the task force is that the task force guidelines are about as much as the family doctor has time to understand and process. If a big national organization recommends against routine screening, then they are not going to do routine screening because they do not have the time, and nobody has taken the time to educate them or include this in their medical education over the years.
That family that you speak of should have been referred—or if they have not, should be referred—to medical genetics for genetic screening. Those members of that family should be in a high-risk screening program.