Answer:
It flavors your food and divides the year up. What is it?
One am I, among six others: Largest, smallest, cold, dark and two brothers
You can break it or drink water from it.
Small, containing light, You'll need it in the dark, It will provide that spark, and shine into the night. Will light up any pyre, 'Cause it can help make a fire.
What has no hands but might knock on your door, and if it does you better open up?
Two little holes in the side of a hill. Just as you come to the cherry-red mill.