A very close relative of mine admitted to committing a murder, but revealed few

A very close relative of mine admitted to committing a murder, but revealed few details about the crime. Do I have an ethical obligation to report what I've heard, even though I doubt very much that there is enough information there to lead to an indictment/trial/et cetera? Of course legally I'm not expected to incriminate an immediate family member, but my conscience seems to be pushing me towards reporting the information despite the lack of any significant real world consequences for the relative.

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