Your post is a bit confusing ur saying your spouse is the principle applicant, what sort of application have you submitted? is it FSW or is it a sponsorship app?
It would have to be one of the economic classes.
hi guys,
can anyone give me some solid advice pz.my ex spouse (the principal applicant) is not ready to withdraw my and my son's name from his application that he submitted before the divorce.i need to change my id n passport now. can i change them n can apply independently without reporting to cic about the change?or i first have to inform cic about the divorce and should wait for the withdrawal confirmation and then can proceed?
and i need guidance about the proceedure of informing cic as well, in case i need to inform about the change.
is anyone well experienced out there to guide me?

You can remove your name yourself if you are divorced. However, your son's name cannot be removed as he is still the principal applicant's dependent child. It could be changed from "accompanying" to "non-accompanying". Who has legal custody? The child will still have to be medically examined even if listed as non-accompanying. Write to the visa office processing the file, advise them of the divorce and that you wish for your name to be removed from the application as you are no longer an eligible dependent.
You say your ex is "not ready". I wonder why that is? Could be a points issue.