If I were TS's mother, I'd be extremely concerned that my son may have this entire crime pinned on him while this rich girl gets treated less guilty.
The way it reads in many of these articles hints as though TS could be blamed for the entire murder. He's the one always pictured wearing the orange jumpsuit and some articles have only him arguing with Sheila.
Although I know he was very much involved, I see Heather as the main catalyst. It was Heather arguing vehemently with her mother in the first hotel. Heather was the one with the ugly attitude for the money or "it" do threat. Heather got TS to come there. Not to mention, Heather got TS involved in using her mother's credit card in the fancy Chicago hotel a month earlier and his plane ticket to Bali paid for by Sheila too. Yes, TS went along with all of this, but Heather sucked him right into it, IMO.
Makes me wonder if ever since middle school Heather was looking for some boy to help her torture her mother one way or the other.