Grandparents are the father or mother of a person's own father or mother. Everyone has a maximum of four genetic grandparents, eight genetic great-grandparents, sixteen genetic great-great-grandparents, etc. Sometimes these numbers are lower and in the case of having only two or three grandparents sibling or half-sibling incest would be incorporated. In cases where the parents are unwilling or unable to provide adequate care for their children, in cases of death or other, grandparents often ta… (More on Grandparent)