Answer:
In the sun it likes to play; In the rain it goes away; Walk or run it always follows; In the mud it always wallows.
Passed from father to son and shared between brothers, its importance is unquestioned though it is used more by others.
Old people and owls are said to be this.
The edge of earth and bread.
What is always on its way but never arrives?
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.