My daughter was 5 when my dad died. They were very close, her dad is non-existant, so my father stood an as a father figure for her.
So it was important for her to get closure, however her mind interpreted that at her age.

She went to his funeral, and even looked inside the casket and said goodbye. Not my idea, she saw us and told me she wanted to say goodbye too.

From there it was; and the angels took him to heaven.... and obviously the story has been modified over the last 3yrs...

My point? Children need to learn about death too, and a natural safe manner is better than tv. They also need to grieve and process the loss, and I believe shielding them can hinder this process.
I don't for one moment think my daughter would have grieved healthily if I told her a fairytale about my dad's death instead.

Her seeing that casket gave her that sense of finality, so she didn't painfully hope he'll return for days or months on end. Like I've seen other young kids do who aren't allowed at the funeral.

After the funeral, immediate family gathered around at our house and watched a slideshow of dad's greatest moments and told stories about him and laughed and celebrated the man we all knew and love.

The funeral itself doesn't have to be traumatizing for him, if you handle it well.