In War and Peace, Tolstoy portrays family life with brutal honestly and an amazing eye for the details that make each household seem real. We are shown several abusive, almost perverse relationships between fathers and their children (the Bolkonskys, the Kuragins), and at the same time, we are given an example of family unity and love (the Rostovs). It's significant that the happy new families we are left with at the end of War and Peace (Nikolai and Marya, Natasha and Pierre) each have someone from the well-functioning family we saw earlier. Those who cannot forge healthy family bonds seem to be doomed to death, or to lives lacking in emotional fulfillment.
Ultimately, the novel places the greatest value on family intactness. Those who are able to create functional family units are cut a lot of slack for their foibles. Those who can't are doomed.
In War and Peace, childhood deprivation and repression is shown to create mature and healthy adults. Those who had a happy childhood can only turn into functional adults by living through some horrible ordeal.