The Compound by S.A. Bodeen

Fifteen-year-old twins Eli and Eddy have the best father in the world who also happens to be one of the richest. When the world comes under a radiation attack, their father sends the entire family to an underground compound to protect them from the radiation effects. Unfortunately, Eddy and Grandma don't make it into the compound before the door is sealed. Six years pass with Eli believing his twin brother and grandmother have died in the attack. Little by little, though, Eli realizes his father has not been completely honest with the family about what really happened. When he discovers a laptop that still has an internet connection, Eli is able to reconnect with the outside world. But can he save his family before his father destroys them all?

Two Tearjerkers!

Waiting for Normal by Leslie Connor - 12-year-old Addie lives with her bipolar mother in a tiny trailer next to the train tracks in upstate New York. When the only stable person in her life (her ex-step-father) moves two hours away, she has to learn to trust the kindness of strangers to help keep her safe and teach her the meaning of family.
The Great Wide Sea by M.H. Herlong - After their mother dies, three brothers and their father set sail on a year-long voyage to the Caribbean. After their father disappears one evening, before the boys can decide what happened to him, they find themselves in the middle of a horrible storm. Finally as the storm subsides, their small sailboat washes them ashore a tiny uninhabited island. Left with little food, little water, and little chance of rescue, the three brothers are forced to face their wildest fears and put their lives at risk.