RJD president Lalu Prasad's eldest son Tej Pratap (above) files his nomination papers from Mahua Assembly seat; his younger brother Tejashwi (top left) is contesting from Raghopur.

The youngest son of Rashtriya Janata Dal president Lalu Prasad is older than his elder brother, if the affidavits submitted by them with nomination papers for the Bihar Assembly polls are to be believed.

Lalu's sons - Tej Pratap Yadav and Tejashwi Prasad Yadav - are making their electoral debut in Bihar but their entry into the poll fray has kicked up a row over the confusion regarding their age.

Tej Pratap, the eldest son of Lalu and Rabri Devi, on Monday filed his nomination papers from Mahua assembly constituency in Vaishali district wherein his age is shown 25 years, which is one year less than that of his younger brother Tejashwi who had filed his affidavit two days ago.

Tejashwi, who is contesting from Raghopur constituency in the same district, has claimed to be 26 years old in the affidavit filed along with his nomination papers on Saturday.

Interestingly, while Tej Pratap has passed Class XII examination, Tejashwi has claimed to be a school dropout having studied only up to Class IX at Delhi Public School, RK Puram in Delhi.

Both Tej Pratap and Tejashwi are contesting the polls from the Yadav-dominated constituencies.

However, when contacted regarding the confusion, the RJD leaders refused to comment but admitted that Tej Pratap was the elder of the two brothers.

Lalu's opponents have demanded an inquiry into the matter.

Meanwhile, RJD leader has slammed the prime minister for turning a blind eye over the alleged killing of a man for beef consumption. His decision to keep away from the rallies of Congress leaders Sonia Gandhi and Rahul Gandhi in the run-up to the Assembly election in Bihar has been made official as well. "Hum alag alag jayenge (We will go separate ways)," he said in Patna on Monday when he was asked whether he would share the dais with the Congress president during campaign.

Lalu also hit out at Prime Minister Narendra Modi, calling him Dhritarashtra, for keeping mum over the killing of a man for beef-eating in a village near Greater Noida in Uttar Pradesh recently.

He said, "Yeh Dhritarashtra (Narendra Modi) andar se darpok hai. Dikhawe ka chilata hai. Jab bolne ki jarurat hoti hai to maun dharan kar chup ke baith jata hai (this Dhritarshtra is a coward from inside. He shouts only to show off. When there is a need to speak he observes silence and sits hiding somewhere)."