The family is the very first institution that God made in this world. A family is created once a man and woman decide to leave their parents and become one flesh in marriage. They may or may not have children, but they are still considered a family.
The Bible teaches the family as a unit that has functioning members. Fathers are expected to provide for the family’s needs. Mothers were tasked to nurture and educate the children. The children are required to obey their parents at all times. As long as these three functions are done continuously with love, the family won’t have major problems.
However, just like in the case of the family of Adam and Eve, they needed Someone more than each other. Without God working in the midst, any relationship, no matter how tightly knit it is, would fail.