Upset over being sidelined in the party and the family, Tej Pratap Yadav, elder son of RJD chief Lalu Prasad, on Thursday resigned as patron of the RJD student wing ahead of the Lok Sabha polls, dealing a blow to Bihar's main opposition party.

"I am resigning as patron of RJD student wing. Those who think I am naive are mistaken," tweeted Tej Pratap Yadav, a former Bihar Health Minister who has been having simmering disputes with his younger brother and the more active Tejashwi Yadav.