You will have to tick Yes for them to accompany you. When you get your PR visa, you as Principal Applicant can land alone in Canada first and your wife & kid can join you later (as long as their visas are valid). IF you tick NO, they will not get visas (I am not even sure if Local Visa Office will process your app or not) and than it'll take ages if you sponsor them later on. For now, you'll have to show 3 persons funds.
Thank you Obaied..I will go ahead and select "YES" or else I will be short of funds
i would like to add some important issues on POF
POF should be PA's name or accompany spouse name u cant show POF if ur spouse is not accompanying u as a dependent
i think u understand