You didn't declare him when you landed so you are now forever banned from sponsoring him to Canada. He is excluded from the family class. This is a very important question that they ask you at landing: do you have any dependents that were not included on your application for permanent residence? If you said no, when you in fact had a child at home, you lied and you could lose your own PR status for misrepresentation for that. In addition - there was more to it than that. Your mother likely knew that sponsoring a grandchild would mean she'd have to meet Minimum Income requirements - so she kept quiet about the pregnancy and the birth of her grandchild. So her PR status is at risk, also. Your son was, by immigration definition, her dependent also! Honestly, I hate to say it, but you (at least) and she should both go back to the Phils and take care of your family. These are tough consequences, but you and your mother both misrepresented your situation in order to gain advantage under the Act and that's not legal. Sorry.
