The love and devotion, and the family values Nicola and Jacopo display.
Note: This question is to be answered on the basis of your own understanding, experience and thoughts. It is strongly recommended that you prepare the solution on your own. However, some pointers for discussion have been provided for your reference.
Their lives before the war;
Small family: father, two brothers and a sister
How war devastated their lives.
In spite of contrary circumstances, how they are driven to get back to their family.