Existentialism for pre-schoolers

I don't know how we got on the conversation the other day, but on our drive home from school, Boden asked about everyone he knows that has died.  He's only 5, so thankfully it's a short list, including musicians.  Based on a conversation months ago, he often brings up the fact that Bob Marley is dead.  Then he asked me about the king singer in Chanhassen--I was puzzled at first, but he said the king who sings at the white office by dad's office.  "Oh, you mean Prince!  No, he's not dead."  In follow-up to mentioning Bueller was dead, he asked about Bueller's parents.  I said I thought they were both dead.  Then he asked about Sloan's parents--"how did Sloan get born?".  I thought it was going to be a line of questioning about reproduction but it took a sharp turn--"how did Sloan's parents get born", "and before that, how did the very first dog get born?"  I said I wasn't really sure where the very first dog came from.  Somehow we moved on to people and dinosaurs and how the very first ones ended up here, on the planet.  I said these were good questions and there are two theories, evolution and creation--no one really knows the answer.  I told him to keep asking tremendous questions and he'll learn a lot!  Thankfully, we pulled into the garage and we moved on to the important topic of what was for dinner.  Sheesh, he keeps me on my toes.