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A grandchild grandchild is a child of one's child. Among the children of the child, a grandson a woman are called a granddaughter with a man. In an antonym, the parent of the parent is called grandparents. Among the parents of the parent, a grandfather, a woman are called a grandmother with a man. Subsequently there is the grandchild to a child in the relation in the special position and calls outside grandchild, a grandchild born first with a first grandchild with the child of the child that it was not it to an inner grandchild, a heiress with the child of the heiress. In addition, it is said when a first grandchild was born that the grandparents "became Grandfather" (Grandmother). There are two systems of sons and daughters to a grandchild as well as there being two systems of the father's side and the mother's side to grandparents. For grandparents, it is said that a grandchild is prettier than a child. Even if the parents indulge you, I give it, but, as for the grandparents, there is always generally general ideas with a thing indulging you whereas I am a person tending I to be scolded strictly. Generally, as for this, as for the grandparents, it is said to the nurture of the grandchild that the reason is because it does not take responsibility to be last so that it is symbolized by words called "the grandchild who is glad to come, the grandchild who are glad to return". In addition, the grandson of brothers sisters, nephew grandnephew is that is to say called a great nephew (a cover), The granddaughter of brothers sisters, nephew grandniece is that is to say called a great niece (a niece). There are four systems to a great nephew and a great niece by a combination of brothers and sisters, nephews and nieces. Furthermore, the child of the grandchild is called(a great-grandchild). As mentioned above, there are these four systems in because there are four systems (sons grandson, sons granddaughter, daughters grandson, daughters granddaughter) to a grandchild. There is evolutionary proof about the parenthood. The reason why a parent brings up a child is that naturally it is thought natural selection. However, it is not always so to take good care of a grandchild. If a parent does it, it is thought enough. Because a grandchild is a blood relative of the direct descendant obviously from the situation of the blood relative choice theory, as for protecting this, value in its own way is accepted. However, a parent does not live till a grandchild is born with most animals. Under such an environment, it is thought that there is not the room where such an action evolves. However, the Homo sapiens has life of the physiology that I have a long than the end of the (the fertilization, delivery and child care) much much in the other in one's breeding time. Grandparents are that child participates, and, by the argument that what this comes from, there is an opinion that the survival rate of the grandchild may rise. An action called the helper that a child helps with the child care of the parent is known for various animals, but it is the opinion which grandparents take this on with the Homo sapiens. It is said that it has influence for the evolution that got longer of the life of the Homo sapiens that the survival of the grandchild rises by can keep the experience that Grandmother in particular has abundant alive for the child care of one's child. If this is right, the reason with the feelings that grandparents deeply attach to a grandchild may come from this.