A seven-year-old boy with dual British-Australian nationality was killed in the Barcelona terror attack, Catalan police have confirmed.
Julian Cadman's family had appealed for information after he apparently becoming separated from his mother.
He is one of 13 people to have been killed when a van ploughed into crowds on Barcelona's Las Ramblas on Thursday.
His family said they would "remember his smiles and hold his memory dear to our hearts".
"Julian was a much loved and adored member of our family," they said in a statement.
"As he was enjoying the sights of Barcelona with his mother, Julian was sadly taken from us.
"He was so energetic, funny and cheeky, always bringing a smile to our faces.
"We are so blessed to have had him in our lives and will remember his smiles and hold his memory dear to our hearts."
They also thanked those who had helped in the search for the boy, saying: "Your kindness was incredible during a difficult time."
Posting on Twitter, Foreign Secretary Boris Johnson offered his sympathies to Julian's family and said: "His death is a tragedy."
Julian's father and grandmother travelled to Spain from Australia following the attack.
It is understood the boy's mother is in a serious but stable condition in hospital after being injured in the atrocity.
The boy's grandfather, Tony Cadman, made a public appeal after Julian went missing, urging people to share his photograph on social media.
According to his Facebook profile, Mr Cadman is from Gillingham in Dorset but lives in Sydney.
A Foreign Office spokesman said: "We are assisting the family of an Australian-British child who was killed in the Barcelona terrorist attack.
"His family have our deepest sympathies at this very difficult time.
"Our staff are doing all they can to support them, working with our Australian colleagues and the Spanish authorities."