I do not see anyone in the family being involved whatsoever, JMO. NG is 84 and I hate to say this but life doesn’t last forever. If this was a family member who was after inheritance, why do all of this and risk their whole life, when realistically NG isn’t going to live forever? What would the benefit be in staging this crime against someone whose time is already somewhat limited? Additionally, her health wasn’t great to begin with. If it was someone close to her, I’d imagine the “easier” and less risky route would be poisoning her. Not only would it draw far less attention, but it’s possible nobody would even question it given her health and age. There would just be no reason for any of them to do all of this if their goal was to harm NG and collect inheritance. JMO.