Family often stands on top of social hierarchies with its strong power uniting all the members. That means it is something more than the sum of each member. There are a lot of constituents in the meaning of a family. Beginning from one origin, a family traditionally shares blood. 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.