When he surprised them with the cameras, I remember him saying something like "it's okay if it's difficult for you to answer" or something. Wonder if that's him saying he knows about the drugs and the supply drying up?  Or perhaps it was about her dementia?  (Or perhaps both, one causes the other?) I looked that up, it's in this video https://www.youtube.com/watch?v=AZtCfBR8ZZQ at 13:30, "Nancy's in a position where it's not easy for her to talk right now, and I understand that." Potentially several meanings in there!