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May i know your update as i am in same situation
If you have not landed as a PR yet then you absolutely need to update IRCC about the birth of your child. If you land without telling them, you're committing misrepresentation and this can have serious consequences.

If your kid was born AFTER you landed as a PR, it's not an issue.
 
The firm is good, they have different lawyers who handles different cases
My child is 14 years old
We submit the application on November , he had medical last march
hello can we connect via email? i have the same situation regarding undeclare step son.