Two British children and their mum are feared to be among more than 200 killed in Sri Lanka's terror attacks.
Alex Nicholson, 11, his mother, Anita, 42, are thought to have died in an explosion at the Shangri-La hotel in Colombo.
Youngest daughter Annabel is said to still be missing.
Dad Ben survived, and desperately searched for his family in the aftermath of the blast, a Sri Lankan attorney told Mirror Online.
The family were eating breakfast at the five-star hotel when a suspected suicide bomber detonated a device, it is believed.
Pictures of Alex were shared on social media in a frantic attempt to locate him after the attack.
However sources in Sri Lanka said his body was later discovered in a mortuary in the capital.
Sri Lanka attacks: Five Brits among 207 confirmed killed in bombings
Sri Lankan attorney Shakya Wickramanayake told Mirror Online that her father had met Mr Nicholson after the terror attack and tried to help him.
She said he and a friend searched local hospitals hoping to track down Alex, but said the schoolboy's body was later found.
Ms Wickramanayake said: "My father and his friend met Alex's father at the hospital when they went to take notice of the death of another foreign national for diplomatic purposes.
"They were helping him search for his son at all the hospitals."
Sri Lanka terror attack: Brit family survived bombing after having a lie-in
She said Mr Nicholson's phone was lost during the explosion, but said he had been assisted by Mahen Kariyawasam, Honorary Consul Of The Slovak Republic, who helped circulate a picture of Alex while he was missing.
Mr Kariyawasam could not be contacted for comment on Sunday night.
The Foreign and Commonwealth Office (FCO) said it was unable to confirm the identity of the British citizens killed in the attacks.
Sri Lanka's foreign ministry said at least five Brits were killed, including two who hold joint UK and US citizenship.
Sources told The Telegraph that Mr Nicholson did not suffer life-threatening injuries, but was seen at the Judicial Medical Office with his ear plastered.
He is said to have been "completely in shock" after the horrifying attack.
An FCO spokeswoman said: "We can confirm that British nationals were among those killed in today’s horrific attacks in Sri Lanka.
“Our staff are supporting the relatives of the victims and are continuing to work with the relevant authorities to obtain further information.
"We extend our deepest condolences to those who have lost loved ones and all those affected by this senseless tragedy.”
Both Mr and Mrs Nicholson are believed to be lawyers based in Singapore.
According to her LinkedIn profile, Mrs Nicholson moved to Singapore in 2012 to work for BP, and since moved to mining and metals company Anglo American.
Mr Nicholson is believed to be a partner at Kennedys Legal Solutions.
Three churches and three hotels were hit in the horrific attacks in Colombo, Negombo and Batticaloa.
A seventh blast in Colombo, hours later, killed two. In the Dematagoda suburb of the capital city three police officers were killed as they pursued suspects.
Authorities said 207 were killed and 450 injured in the attacks, most of which were being blamed on suspected suicide bombers.
Sri Lanka's ministry of foreign affairs said five Brits - including two with dual US nationality - were among the dead.
At least 27 of those who died were foreigners, Sri Lanka's foreign ministry confirmed.
British High Commissioner to Sri Lanka James Dauris posted on Twitter: “I've been speaking this afternoon with Brits in hospital who have been affected by today's senseless attacks.
“My team's and my thoughts go out to all those people who are suffering as a result of the deplorable violence #SriLanka has witnessed this Easter Sunday.”
Sri Lankan authorities have confirmed that three people from India, one from Portugal and two from Turkey were also among the dead.
And a Dutch and Chinese national were also reportedly killed in the attacks.
