You can do that yes. Your can use your relative's address to receive the PR cards and he/she can mail it to you.is it possible i landed canada and come back after 15 days after landed ? is it not effect any thing of process. Even i updat my mailing address with IRCC in canada. Bx i heard after 45 days PR card they will mail so my relative will receive such card at that adress ?
Another option is to apply for a PR Travel Document to re-enter Canada without your PR card. http://www.cic.gc.ca/english/information/travel-document/index.asp