many thanks for the quick feedback , in this case , I will do the following :-
make two different packages
Add the common request letter received in the name of principal applicant in both the packages , along with the consent & courier form w.r.t the applicant.
Actually my question is , we receive 1 request letter from IRCC and the details of the dependent are not mentioned in the letter , so is it fine if we send two different packages with each having the request letter received in the name of principal applicant ?.