The sense of sharing blood gives people a unique identity as a family, the most exclusive group in the world. Home is another word for a family. Even though all the members are not in the same place, they each keep the home in mind as the only and the very best place for each family member. They expect almost everything at home, which they don't at all outside the home. Despite the industrialization scattering each member all over the place, home still takes its firm place as family in their minds.
Love is the best virtue that can be taught by family because it is a family.
A family without it is no longer a family. It means the end of the world, too. In addition, family brings a genealogical record. Simply speaking, family is based on its genealogical history. Each member should know it well and keep it for the next members.