Human association has had a long history which three institutions had struggled to dominate. The first is the family, which has blood and heredity for bases. The characteristics it engenders in humans are innate and immutable. Indeed, they are constitutive of the relationship. Certainly family-living engenders in humans other characteristics which are acquired through association. These, however, are not necessary. Members born to one family may successfully be brought up as members of another; but the innate characteristics remain unchanged. The family was declared by God an intrinsic order of creation.