Renata and Madeline
In episode two, we see an all-out social war when Amabella doesn't invite Ziggy to her birthday party, so Madeline plans a counter-attack by planning a competing event, whisking Ziggy, her daughter Chloe, and several other popular kids to Disney on Ice. Have you ever seen a person as mad about a child's birthday party as Renata is later? She is not rational, so could her anger lead to murder? I mean, she literally says "You're dead in this town!"