Answer:
They are two brothers. However much they run, they do not reach each other.
What has a foot but no leg?
Passed from father to son and shared between brothers, its importance is unquestioned though it is used more by others.
This became a fashion statement in the garden of Eden.
Some adults still use these to count.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.