Here's my take on this nightmare. Josh had a twisted, dysfunctional relationship with his dad. Most likely sexual contact. He moved away from dad as documented but returned with the two kids when wife went missing; proof of a love hate twisted relationship.. I believe Josh knew about Dad's feelings for wife and in a fit of rage and jealousy he killed her. Once the kids were removed from him and he lost custody and was ordered to complete a psycho sexual eval he felt he could no longer cover up the truth and killed himself and the children...

Josh is the son of a man that was arrested for perverse conduct relating to children. Through no fault of his own, Josh may have been exposed to, and affiliate with child perversion as well, without realizing it. The children's welfare and safety are the bottom-line here, and the court decided well by continuing custody with Susan's parents...