Answer:
Through its wounds, water does run. It once held many but now has none. What is it?
Ten men's strength, ten men's length. Ten men can't break it, yet a young boy walks off with it.
My life can be measured in hours. I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
Fatherless and motherless. Born without sin, roared when it came into the world. And never spoke again.
With sharp edged wit and pointed poise. It can settle disputes without making a noise.
I am your mother's brother's only brother in law. Who am I?