It did seem the father was blaming the step mother for a lot of what happened on the day of Sara's tragic death.
Sara had first fallen down the stairs, that became another child kicked/hit Sara and the father did not see the marks on Sara until he tried to wash her body. The father was told by the stepmother to not call an ambulance as the child who injured Sara would be taken to 'prison'. Oh and the stepmother begging forgiveness from Sara as Sara lay there not breathing.
I wonder what made the father change from blaming the stepmother to admitting all guilt
The uncle also apparently volunteered to confess in order to 'spare' the other two adults.
All 3, along with the stepmother's sister, who knew what was going on, are guilty! The neighbours could only do so much and seemed to get shut down a lot of the time.
The stepmother told her sister what was going on in that house!
Sara, beautiful little girl, hope she gets justice for all she endured at the hands of monsters who never put the energy in to loving her but abusing her.