Kulsoom, 68, wife of former prime minister Nawaz Sharif, breathed her last on Tuesday at a hospital in London after a prolonged illness.
"An application will be submitted to the jail authorities seeking the release of Nawaz Sharif, Maryam Nawaz and Capt. (Retd.) Mohammed Safdar, and we are sure that they will attend the funeral of Kulsoom Nawaz", he told Arab News. "May God rest her in peace", Shehbaz Sharif, the former prime minister's brother, said on Twitter.
Begum Kulsoom Nawaz leaves behind daughters four children, Asma, Maryam, Hasan and Hussain.
Kulsoom was placed on life support earlier in the day as her health deteriorated, Geo News reported.
Kulsoom died Tuesday in London after a protracted battle with throat cancer.
Nawaz, 68, who was first lady of Pakistan three times, was diagnosed with lymphoma in August previous year and had been receiving treatment at a private hospital in London for months.
Both sons Hassan and Hussain reside in the United Kingdom and cared for her while Nawaz and Maryam attended near daily hearings of their corruption trial. However, she was soon forced to move to London for treatment, and was unable to return and formally take oath for the seat. She received a Master's degree in Urdu from Punjab University in 1970. She married the Pakistan Muslim League-N (PML-N) leader Nawaz Sharif in 1971. As a result, the family welcomed the military coup of 1977 which toppled Mr Bhutto's government and sent him to the gallows two years later following a controversial trial.
Arif Alvi condoled the bereaved family.
Khan remarked that the government will provide all facilities to the family according to the law.
Moreover, the Inter-Services Public Relations (ISPR) director-general took to Twitter and said that Chief of Army Staff (COAS) General Bajwa also expressed grief over the demise of Kulsoom Nawaz.
"Sad to learn of Begum Kulsoom Nawaz's death".
The prime minister has directed the Pakistan high commission in London to assist in provision of all necessary facilities to the family of the deceased, said an official statement.