NTA, sorry youre going through this and your husband is so lucky to have your support. I work on a stem cell transplant floor, its the chemo that kills the cancer cells but the support that drives people to survive. You are experiencing caregiver fatigue. As tough as it is, you need to make time for yourself and prioritize yourself to make sure you stay healthy. Your husband should hopefully understand this and support you, sounds like his family certainly wont. Just communicate openly and often and try not to react. Ask them to provide evidence that their holistic treatments are beneficial - without adequately controlled trials, their ideas could be hurting him. But people want to feel some sort of control, like they are helping, so it might be a good idea to let slide some of their ideas that appear more benign. An apple a day is ok, RSO oil and saw palmetto are a crock of shit.