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Thanks for requesting me.
If the child is his biological child then your son has all the rights and obligations of any other father.
Without a doubt there will need to be a paternity test as he has no idea the child is his.
If it is whether he has a relationship with the mother or child is his choice but he will be liable for child support regardless as the biological parent always must support his child. Child support is the right of the child.
If the child is his he can apply for custody or access.
So his first step should be to see if she will agree to a paternity test. If she will not then he will need to get a court order.
He should then at least consult with a family lawyer even if he has to self-represent.
Your son can contact the Law Society and use their Lawyer Referral Service. He will be given the name of a lawyer and can consult with the lawyer and the first half hour will be free.
The number is:1-800-661-1095
After that he can self-represent if necessary and get some help here:http://www.albertacourts.ab.ca/fjs/flic.php
Let me know if you need any further clarification.