If its spouse and dependent children, I dont think you need POF and job offer. Pls read more to confirm. I know if it's any other family member like brother or sister u need to show enough POF.if you put you wife and kids as non-accompany and you apply they will still require them to do medicals and submit police report and fingerprint. after you get PR and you land in Canada you can decided to sponsor them. that will be under the family class/family sponsorship. you will need a job or prove of funds later to show you can support them once they land.