Also note, to prove you son qualifies for TD status, based on your TN, you need to bring the original "long form" Canadian birth certificate (or birth certificate with parental information) as well as his Canadian passport (I am assuming he was born in Canada). If you don't have a original "long from" birth certificate, you can request one online. (at least in the Province of Ontario, not sure of others).
For myself I never heard of the "long form" birth certificate before I applied for TD for my child/teen. We had "wallet size" birth certificate. (not good for TD status, must show parents)
The "long form" birth certificate is the one you completed when you requested an Ontario birth certificate, after your child's birth, showing the names of both parents.
https://www.ontario.ca/page/get-or-replace-ontario-birth-certificate
For myself I never heard of the "long form" birth certificate before I applied for TD for my child/teen. We had "wallet size" birth certificate. (not good for TD status, must show parents)
The "long form" birth certificate is the one you completed when you requested an Ontario birth certificate, after your child's birth, showing the names of both parents.
https://www.ontario.ca/page/get-or-replace-ontario-birth-certificate