"It is all nonsense. My grandfather is my grandfather, it is not going to change. I don't need Jaswant Singh to write a certificate for him," he told CNN-IBN.
He brushed aside the debates over the book 'Jinnah-India, Partition, Independence' involving some 'very close' friends of his.
"In the case of Jaswant Singh, I don't think anybody has the right to say he doesn't have the right to write a book," said Wadia.
He expressed his disappointment regarding BJP's action against Jaswant Singh.
"I am surprised, yes. I am very surprised. I am saddened and I am appalled," he said.