They have been camping in this holy city, where Aziz participated in the ministerial deliberations of the Heart of Asia-Istanbul Process. Aziz left for Pakistan this evening.
"We were keen to meet Sartaj Aziz. But the tight security in place did not allow us to have an audience with him. Now we are in the Golden Temple praying for justice to our son who is lodged in a Peshawar jail," said Fauzia Ansari, the mother of 32-year-old Hamid Ansari.
Over 40 foreign ministers and dignitaries of 14 participating countries attended the conference that also saw the attendance of Prime Minister Narendra Modi and Afghanistan President Ashraf Ghani.
Hamid, an IT engineer and an MBA degree holder, had gone to Kabul on November 4, 2012 from where he reached Pakistan, allegedly to meet a Pakistani girl he had been in touch with over e-mail.
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There were no reports of his whereabouts after November 10.
The deputy attorney general of Pakistan had informed the court that Hamid was in the custody of Pakistani army and had been awarded three years' imprisonment.
The elderly couple had been carrying placards to display outside the venue of two-day Heart of Asia conference.
Fauzia said she had earlier sent a letter to Aziz seeking an appointment to request for Hamid's release but in the absence of any reply from his office, she had no option but to stand near the venue of the conference with the placards.
She had filed a writ petition in the Peshawar High Court seeking release of her son after the completion of his jail term.