This film is very inciteful about the complex family "sibling relationship" and family dynamics. It is very believable to those in a (perhaps somewhat less DRAMATIC situation , that is , a similar situation minus the violence such as the horrible suicides !
These people who choose suicide are obviously sick and unbalanced, however,
the situation of misunderstandings in intimate family relations, can occurr when everyday people, take each other for granted and trample mercilessly on each others feelings ; when our tongue utters ALL the thoughts in our head that we FAIL to FILTER before throwing them out to each other .
This film is full of reflection over this evil : taking each other´s reactions and feelings for granted. Hurting and tampling on another by insensitive egotism or selfishness .
This film illustrates the damage over time, to ourselves and others, such callousness effects.