According to the Guardian UK
The older brother went to fight with ISIS after becoming delusional with life in the uk. He started chatting and making friends with other rebels and conversation let to his sisters. They told him that life in the uk is not good for girls and to bring them. He agreed with them. He then convinced his sisters, At first unwillingly as they have not yet warm up to the idea to join him. He then convinced them that there were fellow good looking fighters who wanted them as their wives. They asked their picture , which he immediately send it to them. Few weeks later they were at the border, their brother waiting. He married them off.



