Lucknow: Yashwant Sinha - Senior BJP leader Yashwant Sinha told, if BJP formed the government at the Centre, he would demand a detailed inquiry against Sonia Gandhi 's son-in-law Robert Vadra. Yashwant Sinha told this when he was asked at a press conference here that BJP leaders were leveling allegations of corrupt ion against Robert Vadra, but were saying nothing about any inquiry.