No, Dad admitted that he and the EX were fighting about the kids living with her in a drug infested home! I don't think Dad is a bad guy. I think he may have been trying to save his kids...and this happened.
This is a horrific story, whatever the case. This Duncan fellow is a monster. A real live monster. He is the bad guy and needs to hang.
I didn't know the dad was fighting about meth home. Good for him! That doesn't make him a suspect, I don't believe.