Principal applicant - 550 CAD + 490 CAD
Spouse - 550 CAD + 490 CAD
Children - 150 CAD per child (which means 300 CAD for 2 children)
Note that you can pay the 490 CAD Right of Permanent Residence Fee (RPRF) at the same time as your application fees or you can wait until contacted by IRCC. Good Luck!