We were in exactly the same situation, except my wife got her Canadian citizenship 20+ years ago and we couldn't locate her Indian passport. So we sent an email to CGISF, asking for advice. They replied with the following:
If the Indian passport is not available, please furnish at least three proofs out the ones listed below. These proofs should be self attested by the applicant.
1. copy of birth certificate; 2. copy of domicile certificate; 3. copy of school leaving certificate; 4. copy of college degree; 5. voter's id.; 6. PAN card; 7. any Indian property documentation in applicant’s name.; 8. copy of the Canadian Naturalization certificate.
- Along with the above mentioned documents, an Affidavit should be given by the applicant stating she was born in India, was an Indian citizen till........., she did not hold any other nationality other than Indian and US/ Canadian. this affidavit should be notarized by a local notary public.
We also could not get 1., 2., 5., 6 or 7. So this is what we sent: (a) 8 (as above), (b) Copy of her (high) school leaving certificate, (c) Copy of her State Board of Secondary Education passing certificate + (d) a sworn/notarized affidavit (on stamp paper) from her uncle (Mama) attesting that she was born on .... in [city/state] and that she is the daughter of his sister, etc.
I don't know how your mother-in-law's passport would work, unless you can also get your wife's birth certificate showing the relationship.
Hope this helps. Let me know if you have any questions.
