Absolutely not. Big no to this question. IRCC cannot force the husband. Sir, you already had your questions answered, why do you keep insisting? The answers were very clear. If they do nothing at this point, my guess would be that it is because they have bigger priorities. After all, they would have to prove that he committed misrepresentation, and that would take resources (money) that probably the government isn't very keen on spending.
Again, forget about it. There is absolutely no chance that the wife and the daughter will get PR. Canada is a good country indeed, and protects children and women's interests, but this woman and child are foreigners, so they don't have any Canadian privileges.
The answer to your questions were very clear and those are the same answers you will be getting if you keep asking the same questions. I suggest if you don't have other questions, take the advise you've been given from this forum, the best advise you can get.