Khan's spokesman in a statement said that he had proposed marriage to Bushra Maneka, who has "asked for time to make a final decision after consulting her family, including her children".
The move comes after United States President Donald Trump accused Islamabad of giving nothing to the US but "lies and deceit" and providing "safe haven" to terrorists.
The veracity of the video which was released by the Pakistan foreign office could not be ascertained.
The indigenously-built missile was launched from PNS Himmat and it successfully hit the target, it said.
While Pakistan termed its decision to allow Jadhav's family to travel to Pakistan to meet him as humanitarian gesture, India has accused it of violating mutual understandings.
Khawaja said Pakistan has been open and transparent throughout the meeting, offered in good faith.
The Pakistan Foreign Office said that it didn't wish to indulge in a meaningless battle of words" rejected India's baseless "allegations about attitude of authorities during Jadhav's meeting with his wife and mother.
Police and paramilitary security forces, including sharpshooters, have been deployed at the MOFA to deal with any untoward security situation, they said.
Kulbhushan Jadhav's wife and mother will arrive in Islamabad on Monday to meet the Indian prisoner on death row, the Pakistan foreign office has said. They will arrive in Islamabad by a commercial flight and leave the same day after the meeting, it added.
Saeed had confirmed that his organisation Jammat-ud-Dawah would contest the 2018 general elections under the banner of the Milli Muslim League.
"We want good ties with all neighbours including India and Afghanistan," he told the Senators.
The Bethel Memorial Church has been the target of a terrorist attack in the past.
Pakistan's Foreign Office spokesman Mohammad Faisal confirmed in a tweet that Jadhav's family had applied for visas.
The Foreign Office sources said that adequate security measures will be taken for complete safety of Jadhav's family.
'Surprised and pained that my name has been dragged into Indian domestic politics,' says Pakistan's former foreign minister Khurshid Mahmud Kasuri.
"India should stop dragging Pakistan into its electoral debate and win victories on own strength rather than fabricated conspiracies, which are utterly baseless and irresponsible," Pakistan's foreign office spokesman Mohammad Faisal said on Twitter.
Jadhav was sentenced to death by a Pakistani military court in April on charges of espionage and terrorism.
Pakistan's law minister Zahid Hamid on Monday quit as the government "surrendered" to hardline religious groups, who called off their violent protests in Islamabad that had left six people dead and hundreds injured.
Pakistan called in the Army to restore order after violent clashes.
About 2,000 activists of Tehreek-i-Khatm-i-Nabuwwat, Tehreek-i-Labaik Ya Rasool Allah and the Sunni Tehreek Pakistan for more than two weeks have been blocking the Islamabad Expressway and Murree Road that connect Islamabad with its only airport and the garrison city of Rawalpindi.