“Many people believe that consciousness continues in some way after death. However, there is no evidence to support the claim that it actually happens, and our current understanding of the physical universe does not provide any plausible mechanism for it to do so. Absence of evidence is not evidence of absence, but it seems to be an unlikely hypothesis. However, unlikely hypotheses do occasionally turn out to be correct.”
You could probably put that into a kid-appropriate format, but it’s unlikely to mollify the folks who take the possibility seriously.
