The fifth-grade boy, Kieran Shafritz de Zoysa, had been on leave for the previous year in Sri Lanka and was killed in the bomb attacks Sunday.
He said wife Anita, 42, son Alex, 14, and daughter Annabel, 11, were sitting with him in the restaurant, and mercifully, all three of them died instantly and with no pain or suffering.
"They tried to run away and out of the hotel".
Dr Sally Bradley was among those killed in the bombings.
Tributes have poured in after members of three British families were killed in Sri Lanka's Easter Sunday bombings.
Ben Nicholson has been a partner at Kennedys since 2015.
I am deeply distressed at the loss of my wife and children.
Ben Nicholson, who survived the attack, said Anita was a "wonderful, ideal wife and a brilliant, loving and inspirational mother to our two wonderful children".
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His father said: "Alex and Annabel were the most wonderful, intelligent, talented and thoughtful children and Anita and I were immensely proud of them both and looking forward to seeing them develop into adulthood".
"We are in the position of healing our wounds after a 30-year war", he said in an interview. I have lost a sister, who was not only an inspiration to me, but someone that was respected and loved across Greater Manchester. "He will be greatly missed", he said.
GP Sally Bradley and her husband Bill Harrop, a retired firefighter from Manchester decorated for his role in the aftermath of the 1996 IRA attack, died in the Cinnamon Grand Hotel bombing. She felt very at home here.
"They were the heartbeat of their families and the inspiration in their lives".
The industry was the third largest and fastest growing source of foreign currency, after private remittances and textile and garment exports, accounting for nearly $4.4 billion or 4.9 percent of gross domestic product (GDP) in 2018.
More than 320 people were killed and at least 500 were injured after suicide bombers attacked three churches, four hotels and a block of flats in Colombo.
Sri Lankan authorities say at least 31 foreigners died in the attacks.
The intelligence report attached to his letter, which has circulated on social media, identified the group as National Towheed Jamaar and its leader as Zahran Hashmi, and said it was targeting "some important churches" in a suicide attack that was planned to take place "shortly".
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"We placed our hands on our heads when we came to know that these deaths could have been avoided".
Manisha Gunasekera, Sri Lanka's High Commissioner, told the BBC that the large Sri Lankan community in the United Kingdom was "very concerned".
Other governments, including Japan and Australia, have also cautioned citizens planning travel to Sri Lanka.
Sunday's explosions - centred on the cities of Colombo, Negombo and Batticaloa - collapsed ceilings and blew out windows, killing worshippers and hotel guests in one scene after another of smoke, soot, blood, broken glass, screams and wailing alarms. "There was a time when breaking news was a common thing, every now and then you would hear explosions".
Sri Lankan authorities have blamed the attacks on National Towheed Jamaar, a little-known Islamic extremist group in the island nation.
Senior police officers have been reported saying the warnings referred to the domestic Islamic terror group National Thowheeth Jama'ath.
According to some reports, as many as 24 arrests have been made, and investigations are ongoing.
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The June gold contract was up US$6.20 at US$1,279.40 an ounce and the May copper contract was up 1.65 cents at US$2.91 a pound. By the end of this earnings season, more than 140 S&P 500 companies will have released their calendar first-quarter results.