Answer:
Men have one, women two, and when they become family, it’s three. What is it?
What is the heart of many risks, has a heart, but is not a living being?
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
Iron roof, glass walls, burns and burns and never falls.
My teeth are sharp, my back is straight, to cut things up it is my fate.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?