Explaining Death to my Toddler

I was faced with the task of explaining to my 3-year-old that Grandpa had died. Our only brush with death has been when I had to put our cat down last year but at that time, our little guy was only 2.

I wasn’t sure how to go about it. Since we don’t actively practice religion and my spiritual path has been my own path and not one I want to enforce on our little one, I found myself in a slight dilemma.
What happens to someone when they die if you take out the conversation of spirit, spirituality, afterlife, etc. And I do not wish to speak about a story or a truth that is absolute since, I myself, am open to so many ideas of what COULD happen and what I WISH would happen.

Feeling this great burden, I choose to say what I know is the truth. Grandpa had died. We won’t be able to see him anymore and listen to him play his drum.
The obvious response was “Why?”
“Grandpa was sick and he needed to not be sick anymore and wished to feel happy and peaceful again and he wanted to see his wife since he has missed her so much”.
His next response was “He’s happy?”
I said “yes”
He then said “Can I have some toast?”

And with that, he was complete.

And I became aware of one thing that COULD happen and WISH that could happen when we die.
That when we die, we are happy.
Rest in Peace, Grandpa. We are happy that you are happy.