Researchers have a show that, though sibling will have a positive effect, such positive effects are not factored in child development. For the only child, parents are important factors for lack of sibling. The parents will show the best of care with careful, expression of parents make a child apply. In addition, it’s believed that parents and only child have a closeness, which make parents' attention to the need of children to a good relation and support toward their children’s personal and academic endeavor.