Isabel dos Santos, the daughter of Angolan President Jose Eduardo dos Santos, will leave state oil firm Sonangol before the August General Elections, media reported.
Portuguese newspaper, the Expresso, quoting an anonymous source from the Angolan ruling party, said the move was aimed at reducing the anti-dos Santos family sentiments.
“I will leave soon because I have been under immense pressure,” the Expresso reported Ms Isabel dos Santos saying in private.
The Expresso further said, the president's son, Mr Filomeno dos Santos, currently in charge of the sovereign fund, would also exit his post.
President dos Santos last June appointed Isabel, his eldest daughter, a non-executive director of Sonangol.
Filomeno de Sousa dos Santos (Zenú), 38, was in 2012 appointed one of three board members of Angola's new $5 billion sovereign wealth fund, the Fundo Soberano de Angola.
President dos Santos, 74, and his governing Popular Movement for the Liberation of Angola (MPLA), have been in power since 1979.
He is Africa's second longest-serving leader after Theodore Obiang' Nguema of Equatorial Guinea.
The richest woman
Twelve Angolan lawyers have challenged the appointment of the president's daughter as Sonangol director.
The lawyers have petition the Attorney-General's Office to annul the appointment for going against the public probity laws.
Ms dos Santos is Angola’s first billionaire and the richest woman in Africa with a net worth Forbes estimates at $3 billion.