The sister of Kadiza Sultana spoke on behalf of the family asking her to make contact with her family to tell that she was safe.
Making a direct camera appeal Halima Khanom asked her sister to find the courage in her heart to call her family.
New footage appears to show three missing London schoolgirls in Turkey during what is believed to be their journey to Syria.
The families of three schoolgirls who fled to Syria to join IS have questioned claims they funded their journey by selling family jewellery.
Relatives of London schoolgirls thought to be in Syria tell ITV News police failed to warn them the girls were at risk of radicalisation.?