Kulsoom Nawaz spent these years in the background, as the daughter-in-law of a super-rich industrial family with vast political influence.
Mrs Sharif, her husband and daughter left her bedside to return to Pakistan and be arrested on corruption-related charges just ahead of the July 25 elections, which their party lost.
"She played an exemplary role as a mother, sister, daughter and wife", he said and added that Kulsoom fought bravely in the most hard times. However, she took interest in politics following the end of Nawaz Sharif's second term as the Prime Minister.
Kulsoom Nawaz passed away on Tuesday after a prolonged illness. Both are now serving jail sentence with Maryam's husband Captain (retd) Muhammad Safdarin Adiala Jail in Rawalpindi after being convicted by an accountability court in a corruption case in July.
Begum Kulsoom Nawaz held the office of PML-N on an interim basis in June, 2000, for a period of two years only. She contested for the NA-120 seat despite her failing health and secured 59,413 votes and defeated Yasmin Rashid of Pakistan Tehrik-e-Insaf (PTI).
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The newly elected Pakistani government of Imran Khan has made a decision to extend all help in bringing the mortal remains of Begum Kulsoom from London.
Khan termed the former first lady a "brave woman". She was under treatment at London's Harley Street Clinic since July a year ago.
Born in 1950, she was known for her reserved nature in public, serving as a quiet foil to her husband, who was elected as Pakistan's prime minister three times.
"Sad to learn of Begum Kulsoom Nawaz's death".
The Prime Minister has directed Pakistani High Commission in London to assist in provision of all necessary facilities to the heirs of the deceased.
Former Pakistan Cricket Board chairperson Najam Sethi also expressed his grief. They prayed eternal peace for the departed soul and commiserated with the bereaved family.