While there is a large body of literature that focuses on the neglect children experience from their parents, there’s less examination of how this neglect puts kids in roles of parenting each other. And there is virtually no empirical research on how this affects relationship dynamics later in life—both with siblings and others. Scholars agree that there are gaps in sibling research—primarily an incomplete understanding of how these relationships and roles are affected by abusive family environments. Hooper noted that “the literature is very scarce in this area.”
Some Parentified Kids Grow Up to Be Compulsive Caretakers – The Atlantic