Firstly remember that OCI is not an Indian citizen.
He will be the citizen of that country where he is residing or having got citizenship
Can Minor children apply for registration as OCI Cardholder?
Yes. However, if either of the child’s parents or grandparents or great grandparents is or had been a citizen of Pakistan, Bangladesh or such other country as the Central Government may, by notification in the Official Gazette, specify, the child will not be eligible for registration as an Overseas Citizen of India Cardholder.
Evidence of relationship as parent/grandparent/ great grandparent, if their Indian origin is claimed as basis for
registration as OCI Cardholder:
The document of relationship could be “Birth Certificate” issued from competent authority mentioning both
parents’ name. In case the birth certificate is issued by a foreign authority, it is to be Apostled or endorsed by the
concerned Indian Mission abroad.
In case of minor child whose both parents are citizens of India or one of the parents is a citizen of India –
(i) Copy of child’s birth certificate
(ii) Copy of Indian passport of the parents / one of the parents or copy of the Domicile Certificate or Nativity Certificate issued by the Competent Authority in respect of the parents/ one of the parents or any other proof substantiating the status of the parents/ one of the parents as being Indian citizen(s).
(iii) If the parents are divorced, court order of dissolution of marriage, which specifically mentions that the legal custody of the child is with the parent who is applying for the OCI card.
Evidence as spouse of foreign origin of a citizen of India or spouse of foreign origin of an OCI Cardholder –
(i) Registered marriage certificate; and
(ii) In the case of spouse of an Indian citizen - copy of the Indian Passport of the spouse or copy of the Domicile Certificate or Nativity Certificate issued by the Competent Authority in respect of the Indian spouse or any other proof substantiating the status of the spouse as being an Indian citizen.
(iii) In the case of spouse of an OCI Cardholder - Copy of the present valid Passport of the spouse and copy of the OCI Card of the spouse and copies of the documents upon which the OCI Card was issued to the spouse.