1. Assuming you need the birth certificate to show the relationship to the principal applicant, you can use your passport back page or OCI(similar document) back page (if you have any), or another document with a letter of explanation.
2. Similar thing for a Marriage certificate, your parent's passport's last page should have each other names as spouses and attach a letter of explanation.
See the
bolded/underlined bullet points as follows:
Birth certificates
- Make sure you submit a copy of your birth certificate, and (if you have included dependants in your application) the birth certificates of your family members.
- If you don’t have access to a birth certificate for someone you’re sponsoring, or the one you have doesn’t clearly show your relationship (for example, a name is incorrect), you can give a document that shows the relationship between you and your family member along with a letter of explanation. You should also still include a copy of your birth certificate.
- If you are sponsoring the mother/father of your mother/father, you must include a photocopy of your mother/father’s birth certificate, to clearly show the relationship between the two of you.
Marriage certificates
- If you have a co-signer and they are your spouse, make sure you include a copy of your valid marriage certificate with your application. The document(s) you submit must show that the marriage was legally registered with the government where it took place.
- Note: A record of solemnization is not acceptable for marriages that were legally registered in Canada or the United States of America.
- If you are only sponsoring one parent or grandparent because the other is deceased, you don’t need to include a marriage certificate. You should include a letter explaining the situation, as well as the deceased parent’s death certificate.
- If your parents don’t have a marriage certificate, include a detailed explanation as to why you can’t provide one.
- If your parents are divorced, you can include a notarized divorce certificate to prove your parent is not a dependant of your other parent.