A British man has been questioned by a Spanish judge on suspicion of killing his father in a fight and released on bail.
Ian Bennett, 45, was arrested on Friday in L'Estartit, a seaside town on north-east Spain's Costa Brava, after allegedly attacking his father, 69-year-old Douglas Bennett, while on holiday at a camping site.
Police said he had been taken before a judge and bailed while the investigation continues.
Mr Bennett senior was taken to hospital in Girona with severe head wounds after he was found in a pool of blood but died on Friday morning.
His brother Bob told The Mail on Sunday: "Doug and Ian were so close it was unreal. I have no idea what could have sparked this. I'm absolutely speechless."
He said that he and his brother had not been in contact recently following family difficulties, but could not imagine why he would be assaulted by his son.
"He was still my brother and I'm very sad to hear about his death," he told the newspaper. "I don't know whether it might be relevant or not but Ian was very ill about 20 years ago when he had some sort of mental breakdown."
Another sibling, Douglas Bennett's younger sister, Valerie, 47, added: "All we know is Doug is dead and Ian has been arrested. I'm stunned."
The incident took place at the Castell Montgri campsite, which is named after a nearby medieval castle. It was reported that Douglas Bennett and his wife Gloria, from Chard in Somerset, were staying there in a mobile home with his son and his wife, Louisa.
Sources said that Ian Bennett was under the influence of alcohol at the time of the incident, which in Spanish law would count as an attenuating circumstance should the case go to trial.