Question

Early risers have an edge in life (rewrite using 'who')

Answer 1

Who have an edge in life?

Answer 2

If you want to write the same sentence using 'who', it would be written as 'People who rise early have an edge in life'. Early risers can also be written as 'people who rise early'.

So, the meaning of the sentence remains the same, but only the concept of early risers has been changed to mention about people who rise early.