Family information in the Post-ITA application

[Blackearth]

I am on work permit in Canada, and recently received ITA in CEC category. While filling up the family information section in my PR application, I just found out that there is a discrepancy between my father's name on my passport, and his name I provided on my previous permit/visa application forms (which were incorrect).
I was wondering if the Immigration officer is going to match my father's name on my PR application with my previous visa applications.
Should I give an explanation letter on this, or just ignore the whole thing since I am going to put his name in the PR application exactly as it is on my passport?

Thanks very much.