The five-year-old’s brother Danny told Sky News that Brett and Naghmeh King were being released from prison in Madrid without any charges.
Asked how he was feeling, he said: “I’m in shock, at the moment, we’ve been waiting so long for this moment to come, and it’s finally come.”
He thanked everyone who had supported their cause, including British prime minister David Cameron and deputy prime minister Nick Clegg.
The National Court in Madrid said in a statement that a judge had decided to free the couple after British authorities dropped the case against them.
The Crown Prosecution Service had said it was seeking the withdrawal of the European arrest warrant that sparked the pursuit of the parents, who were arrested on Saturday after taking Ashya from Southampton General Hospital on Thursday. The next hearing in the case had been likely to take place tomorrow. The CPS said it had arranged with Southampton Magistrates Court for proceedings to be dropped and the arrest warrants discharged.
Cameron welcomed the move, saying: “I welcome the prosecution against Ashya King’s parents being dropped. It’s important this little boy gets treatment and the love of his family.”
Simon Hayes, police and crime commissioner for Hampshire, said he would seek assurances about the “quality of the information” provided by the hospital to police. He said: “I now need to be assured as to the quality of the information given by Southampton General Hospital to Hampshire Constabulary.
“Now that Ashya is receiving the medical assistance he requires and Mr and Mrs King will be reunited with him, this is the time to analyse decisions that were made.” Ashya is being treated in Malaga.
A spokesman for University Hospital Southampton NHS Foundation Trust said: “We are pleased that Ashya’s parents will be released and will be able to see their son.
“When Ashya went missing last week we had no option but to call the police because we did not know where he was or what his parents’ intentions were.
“The police asked us to make statements about his clinical condition and need of medical care and we stand by the accuracy of the information we gave them. No hospital should be deterred from raising the alarm when they have doubts about the safety of a child.”
Patricia King, paternal grandmother of Ashya, told Sky News: “He [brother Danny] is going to be allowed to see Ashya any time he wants. That will help a lot, because he’s got someone he loves with him. That is one thing, that he won’t be on his own.
“The way everybody has behaved – the hospital who are now backtracking, the police who are now backtracking. They’ve done wrong, they all know they’re wrong.”