I did not see this post first but i already replied in the other thread.
copy paste.
Since your child is 8 years old, you can request from his pediatrician an immunization record. He must have been given an MMR shot before and may just need a booster. According to previous posts which i'm having a hard time finding those... MMR is a requirement, that's why I decided to have my children vaccinated at St. Lukes when we had our medical.
By the way the one in charge with the vaccination told me it was optional at that time but reminded me that my children must have the MMR shots before leaving to Canada because the certification will be checked at the immigration of Canada, that's why I decided to give them that shot, besides immunization records are needed to enter school.
This may help... from cic website
Health documentation
Children in Canada are vaccinated—also called immunized—beginning when they are newborns. Vaccinations help to prevent serious infections or diseases.
When you travel to Canada, bring official documents that state what vaccinations you and your family have already had. If you or your child has not been vaccinated, call your doctor or local public health clinic right away.
In Canada, immunization or vaccination records are required for children to enroll in school.