Answer
Rajiv Gandhi, Sanjay Gandhi's younger brother, assumed a prominent position within the Indian National Congress (INC) after Sanjay's death in a plane crash in 1980. Rajiv, who was initially hesitant to enter politics, reluctantly joined the party to fill the void left by his brother's demise. Despite his initial reservations, Rajiv quickly gained popularity and respect within the INC due to his charisma and commitment to the party's ideals.