Depending on how close they are to the sick person, and how close you are to the person with a sick family member/friend, you can offer prayers/positive thoughts, an ear to listen if they need to talk, a ride to visit their friend, cooking a meal so they dont't have to worry about it (especially if they are the caretaker), offering to run errands, etc.
It is okay to ask "what an i do". It is easier to give a specific answer than asking "is there anything I can do?"
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