There are a lot of layers here that are both physical and emotional. Nutrient malabsorption points to needing to heal the gut. Do you know if they are all vaccinated and got the covid shot? that can exasperate the issue. This is something you’ll have to go back and look back at the emotional trauma and roots also. What is their lifestyle in general like(food, products in home, supplements, medications, oils etc.) The last piece of it would be healing the gut -easy first steps are quality probiotics and raw camel milk to help seal the gut. If you head over to courses there is a TON of information under mental health and gut health that can help.