A very vital thing I am
That no one can survive without me
I light your every path
And help your eyes see the world
Don't mistake me for my twin brother
Though we sound the same
We are totally different
Hint :
This thing always moves
Sun!
because
it creates light and without the sun, nothing can live. The sun is not the same thing as a son! And it always moves.
Is the answer
light?
No one can survive without
light
I light your every path
yes, light lights stuff
Don't mistake me for my twin brother
light, as in this feather is very light
We sound the same though
yes, they do
We are totally different
In meaning, yes