maryjrose has been a Family Tree Circles member since Dec 2012.
I believe Canada has a rule that states no personnel records will be available to the public until at person is /would have been 100 years old.
I also believe that some records can be released early to family as long as you can prove the relationship.
I would suggest that you send an e-mail to the address that follows and and ask how you can get your grandfathers details of BMD and medical history. Just explain that there might be a gene that's effecting your family's health.
http://www.servicenl.gov.nl.ca/birth/