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I think it's important to tell your loved ones. Although it wouldn't be easy to do.
I would try to spend all this time with them so that they would have as many memories as possible at the end and no reservations about themselves.
I know well that my husband fought until the very end.

Although watching our loved ones die at the end, it can replace many nice memories from our entire life. It is a huge experience that remains engraved in our memory whether we like it or not.