Canada Permanent Resident Card

Question- if I have to leave canada after fifteen days of landing with my family (family will carry on living in canada) because I have work commitments in other country,
-can I leave without a PR card after applying for it
-can my wife receive it on my behalf
-how can I re enter Canada later
-Do I have to declare this fact that I am leaving after 15 days, at the time of landing to the Immigration officer at the airport