An online petition has been launched to re-unite an eight-year-old Turkish kid who is receiving cancer treatment in Germany, with his mother, who is not allowed to leave Turkey due to a travel ban.

The kid — Ahmet Burhan Ataç, — went to Germany on January 26 for a cancer treatment without his parents as his father is in prison and his mother is subject to a travel ban.

The kid’s parents face prosecution for having worked at a dormitory that had links to the Gülen group, accused by the Turkish government of masterminding a failed coup in July 2016. The group denies any involvement.

Ahmet has been suffering from osteoid cancer for more than a year, which has now spread to his lungs.

Ahmet’s mother, Zekiye, who has long been calling for the removal of the travel ban so that she can accompany her son during his treatment, posted a video after she saw Ahmet off at the airport. In tears, the mother said: “Ahmet did not want to go to Germany without me. I told him I would come in two weeks. My son was dying before my eyes. … I am appealing to the authorities: Please don’t keep me separated from my son.”

Zekiye Ataç was also jailed for two-and-a-half months on charges of being a Gülen movement follower. She was briefly detained in October.

Ahmet Burhan has been suffering from osteoid cancer for more than a year, which has now spread to his lungs.