Mary Jane Hemmings, who lives next door to the family in Barnsley, South Yorks., said: "It doesn't surprise me that he went to fight against ISIS. "But I didn't know he was there. I'm not even sure his family knew."

Mary, who has known the family since they moved in 14 years ago, said she had always taken an interest in the children as she doesn't have children of her own.

She said: "I would often talk to Kosta. He went to university to study drama and had hopes of being an actor. "He graduated and got a couple of bits of work in TV but he never made it, he then realised he needed a job.

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