Way back, Chandrababu Naidu grabbed power from his father-in-law, late NTR and assumed the charges of a chief minister. From then on CBN has gradually been growing and got a strong hold in the party now. Moreover, he has taken all measures to promote his son Nara Lokesh as the one and only successor of TDP.
Late Nandamuri Harikrishna was the only rebel within Nara-Nandamuri families. Many a times Harikrishna would come in front of media and would exploit TDP's blunders in administration. Harikrishna was also envisaged that he would campaign against TDP's blunders for upcoming general elections.
Since Harikrishna breathed his last, there appears no one to defy CBN. As such, CBN can comfortably work for the party's victory letting all members of his family to support TDP. However, Purandewari is an exception, as she has been working against the party for a long time as she was very much inclined to other political parties.