"Hospice care" generally means no longer receiving drastic treatments like chemo, just treatments for discomforts such as pain and anxiety. Often hospice patients are no longer able to process solid food or food at all.

People taking care of very sick loved ones actually tend to get a lot of unsolicited amateur medical advice, which may be given with good intentions, but to most people it's unwelcome. They are already coordinating with the person's doctors and nurses and doing their own research, and the advice-giver doesn't know the whole situation.

I hope your wishes are clear to your loved ones - maybe a reminder to discuss this with them.