Answer:
There is one in every corner and two in every room.
How do you spell hard water with only three letters?
Passed from father to son and shared between brothers, its importance is unquestioned though it is used more by others.
I'm the source of all emotion, but I'm caged in a white prison.
What has feet on the inside but not on the outside?
Two little holes in the side of a hill. Just as you come to the cherry-red mill.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?