The legal parent-child relationship must aim to maintain the integrity of the family unit, ensure the welfare of the child, and uphold societal norms that value the marital family structure. These interests reflect historically rooted traditions that prioritize stability and the protection of family units over the biological connection alone.
For example: Even if a man is biologically related to a child, if that child has been raised within a stable, intact family by another man who has fulfilled all parental roles, the law may prioritize sustaining that family unit over recognizing the genetic link.