"What will happen to Rahul? That decision the family will take," he said when asked if Priyanka should play a bigger role in the party.
Speaking to PTI on the sidelines of the formal launch of his autobiography "One Life is Not Enough" last night, Singh said, "They are united. Only three people will take the decision (Sonia, Rahul and Priyanka)".
About Sonia, Singh said he was surprised to hear that she would be writing a book.
Claiming that Sonia's reaction had helped in bigger sale of his book, Singh, who was once a close confidant of the Gandhi family, said, "I don't know who advised her. I would have said just don't get involved in this. The net result is that the sales have gone up".
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Singh said he wants Sonia to start writing the book she promised as she is one of the world's most powerful people.
The former Union Minister said when he was close to Sonia, he had suggester to her to write a book and she had then declined saying that Priyanka would be writing her biography and she would join as co-author.
He also said that there were certain things which he did not reveal in his book.
"I have not written many things. As it will be dishonourable for me to spill all the beans. There is at least 10 per cent which I will never talk about," he said.