Well, that's quite a question. Maybe we first have to get the answer to the question, "why did CS and ES (a stepmother) were granted full custody of the daughter of whose existence CS never knew until the was five years of age?"
And many others, including CPS report that seems to have been silenced?
After the older daughter said that living with CS and ES "totally changed her as a person", and then another child in their custody, Parker, died in a hot car, you wonder how bad the atmosphere in the house was.