Congress Party Vice-President Rahul Gandhi arrives on the second day of the first session of India's newly elected parliament in New Delhi on June 5, 2014.
Rahul and Varun Gandhi on the opposite sides of the political spectrum took oath as members of the 16th Lok Sabha one after the other.
The cousins, who have won from neighbouring Amethi and Sultanpur constituencies in Uttar Pradesh, belong to Congress and BJP respectively.
Rahul was the first to take oath in Hindi in the name of God, followed by Varun.
After taking his oath, Varun, while returning to his seat, greeted Congress President Sonia Gandhi with folded hands.
Varun forgot to sign the register after taking oath and was quickly reminded by Congress member K Suresh and Mrs Gandhi to sign the register.
While Samajwadi Party (SP) chief Mulayam Singh Yadav had taken oath earlier in the day, other three party MPs - his daughter-in-law and wife of Uttar Pradesh chief minister, Dimple and nephews Dharmendra and Akshay took oath later.
Akshay's father and Rajya Sabha SP member Ram Gopal Yadav watched his son take oath from the Speaker's gallery.
Former UP Chief Minister and BJP leader Kalyan Singh's son Rajveer also took oath.