Final answer:
Parens patriae refers to the legal philosophy by which the state assumes the role of the parent of the child.
Step-by-step explanation:
The term that refers to legal philosophy by which the state assumes the role of the parent of the child is parens patriae. Parens patriae is a legal concept that gives the state the authority to step in and make decisions for the welfare and protection of individuals, particularly children, who are unable to make decisions for themselves. This concept is often applied in cases involving child custody, child protection, and juvenile justice.