I think that this is a good topic in general to keep a collection of thoughts on, so perhaps we could pin this one, or another, at some stage based on the original question, "How to explain death to young children?"
For me it would depend on the age, as my response—while the same— would use words based on what I think my child could understand. I would be completely honest to how things actually are, in terms of their individual energy and consciousness returning back above to the next level, but I would likely limit my response and not expand beyond that level in terms of higher self and source unless they asked. It can be a lot to take in to understand that, even though children are so very open energetically and mentally speaking.
I would be very clear that death is not an end, but simply a process within a long journey that takes place for a larger part of us. I would also explain that we can all meet up again if we wish to, after being here, so there is no ending in the sense of forever being separated.
I think that in some instances, if the child was at the school age and was attending a public school, this could cause issues if they beliefs were spread around, so this is why it's important to have the child in the right environment, and with the appropriate friends, to support their understandings.
It would also be important for me to explain that we need to be careful with belief, and to remain open and base our experiences on what we go through directly, and how we can connect into the reality of what and how things are, based on a connection back to where we come from. As a child that connection may already be there until they get older, but if encouraged they can maintain that connection, especially if they are brought up in a healthy and balanced environment.
I could say a lot about this but those are the first things that come to me.