9. Why doesn't Paul feel at home with is family?
He doesn't feel at home with his family anymore because they are no longer his family.
His family is off fighting the war or oin the front lines. 
His family is all the men he met and became friends with in the war.
Also he doesn't feel at home because his family doesn't understand what he went through.
They don't know about the tough nites he went through and the gruesome sights he saw.