Subhas Chandra Bose's grandnephew to meet Modi in Berlin today

"Subhas Bose did not belong just to his direct family. He had himself said that the whole country is his family. I do not think it's just the duty of the family to raise this issue (of declassification of Netaji files)," Surya Kumar Bose, grandnephew of Bose, said.

Wading into the row, Ardhendu Bose, Netaji's nephew, said, "I think it was a bit harsh that they were personally monitoring (family members)."

With the documents revealing that intelligence services and diplomats overseas were told to keep an eye on what they were doing, "probably goes to prove that they knew that Netaji was not dead. They knew that he did not die in an air crash," he said.

"The family feels betrayed. Truth should prevail. All hope that the Indian government will bring out the truth," Mr Ardhendu said.

"It is the duty of the people of India to raise the issue. If I do get an opportunity to meet the Prime Minister, talk to him for a few minutes, then I would certainly raise the issue," said Surya Kumar Bose.

Surya Kumar Bose, also the president of the Indo-German Association in Hamburg, has been invited by the Indian embassy to attend a reception for PM Modi in Berlin on Monday.

Another grandnephew of the charismatic leader, Chandra Bose said, "The time has now come to declassify Netaji files. Saying it would affect India's relations with other nations is simply a lame excuse. The Modi government has been talking of transparency and now it is the time to provide transparency by releasing those files which will tell us what happened to Netaji during his last years."

Chandra Bose expressed his surprise over the Modi government giving the "same excuse" as the Prime Minister's Office under Manmohan Singh to block declassification of Netaji files.

"The Prime Minister's office under the Manmohan Singh government made a statement saying if they de-classify these files, they would have problems with friendly neighbours. That's a damaging statement," he said.

In a Right to Information reply, the Prime Minister's Office has refused to declassify secret files relating to Netaji arguing that the "disclosure would prejudicially affect relations with foreign countries."