You better follow what is in your application. Else it's gonna be a big issue later like you lied to them. They have the records of your family in Canada as you've filled in your family information form
You gotta figure this very well man; but in all these, don't panic, tell them only what you can prove. If you are showing that you have family in Canada, then you're looking to stay in Canada after your studies but if you are proving that you have family or ties in your home country, you need to be wise about it as well. Don't outchurn information in your head. Just provide enough proof for every information you provide.
I wish you the best.