Animals do not create, question or decide whether to obey moral codes. Humans must be taught and learn. The human mind can absorb knowledge and. This character is not created instantaneously. They need the warmth and protection and security of family and of home life.
Man is, now, composed of matter.
Humans, by repentance, surrender to God and acceptance of Christ, may be in mind and attitude converted - may receive God's. Thus, they ate actually begotten as God's children. Each angel is a separate creation. They are, even now, the begotten children of God. Therefore God ordained the family relationship for human beings.