When was you father born?
How old are you?
This is a difficult area of law especially where it concerns overseas citizens.
But briefly the law is that if you were born outside the United Kingdom before 1 January 1983, you became a British citizen if, immediately before that date, you were a citizen of the United Kingdom and Colonies and had the right of abode in the United Kingdom.
In your case your father would have to establish that, having been born before 1983, he was a British Citizen by virtue of your grandfather holding a British Indian Passport and therefore a citizen of a UK Colony . If your father can prove his citizenship of the United Kingdom and Colonies , then you could potentially claim citizenship by descent.
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