Answer:
I am owned by every man, though my length differs. Their wives use me after getting married. What am I?
I row quickly with four oars but never comes out from under my own roof.
I am used when you jump off a bridge for fun.
Fatherless and motherless. I was born without sin roared when it came into the world. But I never spoke again.
I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?
I am your mother's brother's only brother in law. Who am I?