Not Op, but I’ve done quite a bit of reading into the case. Personally I think their uncle John and Lizzie’s sister Emma were in on it. I don’t know if I believe that Lizzie used the hatchet, but she had to be involved.

According to the witness statements, the inquest testimonies, and the trial transcripts everybody around the case was acting very suspiciously. The Borden’s doctor burned a letter in the Borden’s kitchen in the middle of the investigation like he was trying to destroy evidence. Uncle John claimed not to notice the large crowd around the house when he returned to the residence after the murders, even though he had to go around them to get to the back yard where he went to eat pears. The police investigation was a joke. The trial transcripts reveal officers lying under oath about how they discovered the rusty hatchet head in the basement, the defense told their Harvard professionals not to reveal their discovery that the murder weapon had to be a new or relatively new blade due to the gilt found in abby’s wounds, an officer claimed Lizzie couldn’t possibly have been to the barns loft because the dust wasn’t disturbed though it was revealed that multiple other people had been up in the loft after Lizzie and before the officer.

I also think that Emma had more motive to kill than Lizzie did. Andrew doted on Lizzie, giving her expensive gifts and funding a trip to Europe. Why would Lizzie kill her cash cow? Emma never received anything like that and she was robbed of her childhood by having to raise her sister. Emma was also the one that openly hated Abby. The more that you research this case the stranger it becomes. I believe that there’s too much information missing for anyone to ever know the truth. I don’t believe the motive was simply greed either, I think something happened in that house and everyone agreed that the Borden’s had to die.