When I think of TH's son, my mind goes to TH motive again. Weren't there issues between Kaine and her son, IIRC. I'm a little foggy on it but I believe he lived with them at some point(?) If Kaine couldn't deal with her son, but she had to deal with Kyron, who she apparently despised, it would be one more thing that could provide motive. Not just to rid herself of Kyron, but to punish Kaine. All moo, and just thinking out loud, not really suggesting her son had anything to do with anything. I wonder what his relationship with Kyron was like and what he himself is like. Does he still live with TH at her parents' home (assuming she still does)?