Which "home environment" factor seems to be most important for the intellectual development of a child?

Question

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Parental involvement with the child has consistently been found to be the most important factor in a child's intellectual development. Parents who actively engage with their child through talking, reading, and other educational activities have been shown to have children with higher cognitive abilities and academic success. Having siblings or a particular parenting style may have some influence, but they are not as consistently impactful as parental involvement.

Which "Home Environment" Factor Seems to Be Most Important for the Intellectual