12. "there are some tough convos where you can just stick to" In response to In response to 7
the science of what happens rather than your beliefs. Beliefs are tricky. Since nobody can really explain what happens to our souls, energy, etc., it may be easier to talk about the parts we can explain about things.
Not to suggest getting to detailed about that, but you'll have to judge how far you can take it with the kiddo.
another option is to discuss the ceremonial processes related to death. this can also help stay away from getting too deep into things.