Malicel said:
how about a DNA test? what if he doesnt know that he needs to update his documents? and they are not aware of the rules/definition of the member of thefamily class/ since they were not interviewed during the processing of their papers.
Men have lost appeals like this even when they had no idea they had a child and found out after they had already immigrated. DNA won't help here.
The problem is, when filling out the forms it clearly asks for details of all children, in several places.
In addition, when people get their visa and land in Canada, there will be a letter with the documents saying they must report all changes to their family; when landing, they have to fill in a form that asks about family.
Having the child be adopted won't work. CIC will view it as an adoption of convenience, and it will be rejected. To sponsor an adopted child, it has to be a real adoption where the ties with the child's biological parents have been ended. You don't want that.
When your husband sponsors you, all your dependents are included. You cannot omit your child, then sponsor him later yourself.
Really the best way is to immigrate on your own.