This is so basic and so true. Anyone who can not understand this has completely lost all touch of what it is to be human. This is beautiful, it is not saying people or parents are perfect but that the potential is absolutely greatest in the family of any other unit that has ever existed or will ever exist.
Every child needs and wants a dad, just like they need and want a mother. Sometimes death robs a child of this, and the Lord has said of this:
James 1:27 Pure religion and undefiled before God and the Father is this, To visit the fatherless and widows in their affliction, and to keep himself unspotted from the world.
To visit the fatherless and the widows. This is pure religion. So when a child loses their father, the Lord has said that the rest of us are to help make up for that loss by visiting and comforting them, and spending time with them.
In "The Family: A Proclamation to the World" prophets and apostles today have said, at least in part: "We, the First Presidency and the Council of the Twelve Apostles of The Church of Jesus Christ of Latter-day Saints, solemnly proclaim that marriage between a man and a woman is ordained of God and that the family is central to the Creator's plan for the eternal destiny of His children...
...Husband and wife have a solemn responsibility to love and care for each other and for their children. "Children are an heritage of the Lord" (Psalms 127:3). Parents have a sacred duty to rear their children in love and righteousness, to provide for their physical and spiritual needs, to teach them to love and serve one another, to observe the commandments of God and to be law-abiding citizens wherever they live. Husbands and wives—mothers and fathers—will be held accountable before God for the discharge of these obligations. The family is ordained of God. Marriage between man and woman is essential to His eternal plan. Children are entitled to birth within the bonds of matrimony, and to be reared by a father and a mother who honor marital vows with complete fidelity..."