Hello all, I am trying to prove sibling relationship with my brother. I do have my parents marriage certificate which has both of our names as offspring. Since earlier days, marriage registration was not a compulsion, hence my parents applied for registration in around 2010 when we processed their visa for Canada. Luckily I see that template of marriage certificate does contain both of our names with date of birth. Is that document sufficient enough to prove sibling relationship OR do I need to provide additional supporting document like OCI of my brother which I can but my father’s last name is slightly misspelled?