By Islamic law you can not be adopted, just raised by another family staying on contact with the biological one. I suggest you ask an Imam about this or if the biological family agrees to it.
No. He was raised by his birth parents. Gerald Ford and Bill Clinton were presidents who were adopted by their step-fathers and changed their last names.
how can i trace my fathers Indian passport
Her Adopted Fathers - 1911 was released on: USA: 27 March 1911
legally, no.
Though not strictly illegal at this point of time, it is Paternity Fraud and the laws will be changed.
no
Contact the Vital Statistics office of the state where you want the death certificate from, who can help you out.
Yes
If you live in the US, the fact that he changed his name is irrelevant. Since you adopted him, you are the legal father and as such are responsible for child support for as long as the court has ordered.
Since you were adopted by another man at age 6 and now go by his surname I don't think you can be considered you biological fathers child in the eyes of the law now. Your biological fathers name is not on your birth certificate. You could try and see if social security would except a DNA sample from your biological fathers other children to prove that you are his child or maybe your biological fathers parents(this would be better) if any of them would do that for you.
Because
Dr. Loyal Davis