In fact, if you don't have a plan to sponsor your family members in the future such as your parents, parents in law, and so on then it is not necessary to add them in your application.Yeap. I am one of the examples listed.
You must list all family members in your application for permanent residence, whether they are accompanying you to Canada or not. You must also provide details on family members whose location is unknown (including those missing or presumed dead). If you don’t, you will not be able to sponsor family members at a later date if they are not listed on your application.
[Source]: Same as above.