Why are Tej Pratap Yadav and Tejashwi Yadav at loggerheads?

Days after resigning as the mentor of the party's students wing, Tej Pratap Yadav, elder son of RJD chief Lalu Prasad, on Monday announced a new front 'Lalu-Rabri Morcha' which may contest 20 Lok Sabha seats in Bihar in the upcoming general elections. The announcement comes amid the ongoing power struggle in the RJD family in the absence of Lalu Prasad, who is undergoing treatment at a government hospital in Ranchi after being convicted in fodder scam cases.