However they were then reportedly arrested for supporting terrorism.
Jack Letts is suspected of being the first white Briton to join the delusional cult.
He left his home in Oxford to head for Syria.
His parents Sally Lane and John Letts however have long claimed their son is innocent.
The south-east counter-terrorism unit said: “We can confirm a 55-year-old man and a 53-year-old woman, from Oxford, were arrested on suspicion of sending money to Syria which could be used for terrorism purposes… and were bailed until 17 February.”
He added: “Any parent’s going to act the way we have and feel the way we do. You wouldn’t be a parent if you didn’t try to protect your child.”
“He’s sending desperate messages to us saying it’s cold or he doesn’t have food or he can’t see.
“We know that legally we’re not allowed to help him. I just don’t understand that.”
“Thinks you have a son and you dont. Thinks your married when your not.
“The formula with the media is simple: English guy became Muslim + went to the Middle East + followed Islam = ISIS + eats babies x evil.”