"It's not important to my mother, brother or myself, that she (Sonia) become prime pinister," Priyanka, 32, told reporters after casting her ballot in New Delhi in the final and biggest phase of the five-round general elections.

"My mother is doing her job to the best of her capacity. It (power) is not a priority for any of us," said Priyanka, who is often touted by the media as a potential Indian prime minister due to her political charisma.

Leaders of India's ruling Bharatiya Janata Party-led alliance have repeatedly raked up Sonia's Italian origin as an election issue, saying her foreign birth ruled her out to lead the country.

Priyanka, scion of the influential Nehru-Gandhi dynasty which has given India three prime ministers, is not contesting the elections slated to conclude Monday. Results of the marathon five-stage elections will be known on Thursday.