High fat and high carb together are probably the worst for a person. With high fat, insulin is moderated and you don't store quite so much. Other people can have a lot of success with high carb, low fat diets.
High carb high fat is the worst of both worlds. A primal breakfast shouldn't be making that much difference, though.
You can't change him if he doesn't want to change. It's not your body and it's not your choice. It sucks (my mom is the same way) but the only thing to do is get them to read the book and encourage them.