Think all of us would agree that your family got very lucky if they have not had serious repercussions already. It seems like you may not be aware of the actual story behind the fake documents but it is highly unusual for a Canadian PR (or citizen) to be walking around with a UK passport with an alias. Citizenship reasons don't make sense. Also many Canadians get very frustrated and start questioning the need for asylum when the applicant returns in 5 years (maybe even less) to their home country.
I agree that we were very lucky we didn't face any repercussions. But what I stated earlier that my father was told by both side lawyers that his family's residency status wouldn't be taken away because of his actions is the same thing I was told by the CBSA office I met a few years ago.
I don't know if it was luck specifically in our case or if it's a general rule for them. But the officer said to me we wouldn't punish the whole family for the actions of your father.