For a family of 4 ( 2 Adults , 2 Children ) what is the amount of prove of funds we need to survive to immigration requirements, we read somewhere there is a required amount ?

The amount is CAD$14,784 assuming that you intend to reside in a city of 500,000 people or more. This is a requirement for eligibility in the immigration process for a permanent resident applicant in the Skilled Worker program.