The bond

Axel age 17 is an older brother he is always looking after his younger sister Emily age 12. Eldest always have to look after the younger ones and protect them from harm's way they live in the United States west states as they and their family are going to get their passport in the city of Port for a first family vacation an attack hits the city by a group of extremist then it start to enable the rest throughout the states they get the military gets backed up the middle of the country the main characters are to now get to the middle for a chance at safety can they get through this pain together?