Answer:
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
You use it between your head and your toes, the more it works the thinner it grows. What is it?
I am your mother's brother's only brother in law. Who am I?
War fought with pieces on a board.
If there are three cups of sugar and you take one away, how many do you have?
When is it bad luck to see a black cat?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?