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It is each parents right to choose if they want child support or not. While it is not required in Canada the judge will ask you to think about it. Even if you do not want it consider placing a portion of the money into a savings account. Keep in mind 12 year olds always need some spare cash for things so speak to the mother and ask her if she would consider paying a portion of child support so that the child may keep it as spending money.
In the end it is your choice if you want it or not. The courts will not force you to take child support.