Egyptian authorities will decide later whether to release Ibrahim Halawa from prison.
The 17-year-old was detained along with his three sisters -Omaima, Somaia and Fatima - during unrest in Cairo in August.
The three sisters who are all in their 20's were released on Friday.
However, Ibrahim, who was also detained with them, remains in prison.
His sister Nusayba says they expect a decision on Ibrahim today.
