I'd been wondering about your MIL and had forgotten about the OT section. Duh! I hope your son has recovered. In dealing with my own mom, I am realizing that when dementia starts to set in that it is much like dealing with a toddler. They become very self-centered and can no longer think about or understand the needs of others. They want what they want, and they want it NOW. I have never been a smoker, so I have no idea how much of a nicotine kick those patches release. I hope you can get her to accept those things as you try to wean her off that powerful addiction. Unless she is ready to quit, I doubt hypnotherapy would work.
After he developed double pneumonia as a young child, DH has had chronic asthma. Whenever he gets sick, he has to go on a breathing machine, but knock on wood, hasn't been hospitalized since childhood. I hope your son learns how to manage his asthma and maybe get a breathing machine for home.
This Sandwich Generation thing is rough, isn't it? Hang in there. You are a very special DIL.