You are right. Misred. The fact that the children have been in school for 5 years shows that they are well adjusted in the school system so that is another point against best interest of the child.I don't believe that's correct. Oldest child got PR along with the parents. Other two children were born in Canada and are Canadian citizens.
The biggest issues, as OP was warned, is that there was no work done in Canada before going abroad, this seems like a very small company, OP has a financial interest in the company, etc. This shouldn’t count as a temporary transfer abroad from a Canadian company.