My mother is a forensic pathologist, and also the mother of two sons.
She resented me because my father died, and after remarrying and giving birth to my younger brother, she became utterly cold toward me and abused me at every turn.
She even dissected me herself to cover up my younger brother's crimes, destroying every trace of evidence left on my body.
But she didn't know that the person who had died was me.
When the unidentified corpse was revealed to be mine, she went mad.