After the Supreme Court disqualified Nawaz Sharif from his seat past year, Kulsoom was elected to Lahore's NA-120 constituency in a bye-poll.
Kulsoom Nawaz married Nawaz Sharif in 1971 and her husband was prime minister of Pakistan on three occasions - 1990-1993, 1997-1999 and 2013-2017.
"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.
In a statement, Prime Minister Imran Khan, a bitter rival to the Sharifs whose PTI handily beat the outgoing PML-N at a general election in July, said Nawaz Sharif and his daughter would be "provided all facilities that they are entitled to under law".
Nawaz Sharif and Maryam Nawaz, who are serving sentence in Adiala Jail, have also been informed about the demise of Begum Kulsoom. In the video, Nawaz Sharif is heard saying, "Kulsoom, please open your eyes..." She was running for a by-election in her PML-N's stronghold of Lahore at the time.
Kulsoom was placed on life support earlier in the day as her health deteriorated, Geo News reported.
"She will be laid to rest in Pakistan", the family confirmed.
The information minister said that Kulsoom's sons Hassan and Hussain will be arrested upon their return to Pakistan, however, they will not be arrested if they obtain pre-arrest bails.
Begum Kulsoom Nawaz was born in 1950.
Her first direct exposure to the harsh political landscape of Pakistan came in October 1999 when her husband's government was toppled and he was imprisoned.
President Dr Arif Alvi has expressed grief over the passing away of Begum Kulsoom Nawaz.
"May Allah bless the departed soul eternal peace at Heaven", he remarked.
He has directed the Pakistani High Commission in London to assist in provision of all necessary facilities to the heirs of the deceased.