"They are the most vulnerable group among the refugees: unaccompanied minors in Greece. 4,800 children, aged 2 -17. A real challenge for those in and outside Greece dealing with their protection."
See: Number of unaccompanied refugee minors in Greece rises to 4,800 (Keep Talking Greece, link):
“30 percent of them are orphans. Seven out of ten have families in Europe and need to be reunited.
The protection of unaccompanied minors is a major issue for the government, the creation of appropriate accommodation structures is imminent, their transfer from the overcrowded islands an urgent necessity.
The number of unaccompanied children in Greece is increasing: while they are approximately 2,500 unaccompanied children in 2017, their number has reached 4,800 in 2019, according to data released by the National Center for Social Solidarity on October 15.”