A better place for the biography of the person who has died may well be either the service booklet or even a separate, commemorative booklet which includes photographs, extracts from diaries, recipes – you name it. That’s the sort of thing people are going to take home and keep.
The life story of the person who has died is an important chapter in your family history.
A funeral is a proper time to bind, especially, the young into the continuum of your family story. But the best way to do that may well be to write it down.
It’ll also free you up to talk about the really important things.