Annushka said:
What if the principal applicant got married after he received the visa. How can his wife get the permanent card too?
It depends largely on when did principal appliant got married ? If he got married after visa and before landing, he must inform visa officer before landing, otherwise in the future there are bring chances of rejection of wife application for PR.
But if principal applicant got married after landing, then he must sponsor wife under family class , and for this, principal applicant must be in canada to sponsor.
In case principal applicant got married before PR Visa and didnt inform visa officer, then there are chances that wife PR application will be refused, because as soon as you get married during the whole procedure of PR (before Landing), one must update visa office (change of family composition etc )