SNP MSP Jamie Hepburn said "we owe it" to the memory of two murdered children, whose fathers are campaigning for tighter international gun sale controls, to secure an arms trade treaty.
Mr Hepburn welcomed David Grimason to the public gallery during his member's debate on 21 June 2012.
Mr Grimason's two-year-old son Alistair was shot dead in a Turkish cafe in July 2003.
The SNP MSP said: "David Grimason along with Dr Mick North who lost his daughter Sophie in the Dunblane tragedy have been working with
to demand global action on the arms trade.
"As a father I cannot begin to imagine how they have gathered the strength after the tragedies that befell them to go on let alone campaign in this fashion.
"I think presiding officer we owe it to the memory of their children and all the men, women and children who can be saved to see an international arms trade treaty is secured. "
He earlier said it was perverse that on a planet with six bn people, 12 bn bullets were manufactured each year.
The United Nations will hold negotiations in July with the goal of finalising a global arms trade treaty which the governments of 153 countries have been working towards since 2006.
Community Safety Minister Roseanna Cunnigham said "behind the faceless statistics lies personal tragedies, lives lost and lives ruined".
Ms Cunningham said it was "long past time for the international community to take a stand" it was about the rights and hopes of real people who had the right to a life free from fear.
She said that David Grimason and Amnesty International would be meeting the first minister next week to talk about the campaign.