Have to politely disagree with Mr Ager's analysis/conjecture. While I may concede that some abuse may have happened in Alex's childhood, there's no solid or even implied link to either parent being the abuser. Unfortunately, people hang for such circumstantial or presumed evidence. I'll generously grant Ager that there may have been sexual abuse on the part of the law (Deltoid, police) and if any case may be made regarding the parents' culpability, it possibly would be their turning a blind eye to the presumed sexual abuse (there's a legal term for this but it escapes me at the moment).
