Answer:
You use a knife to slice my head and weep beside me when I am dead.
I am a mother from a family of eight. Spins around all day despite my weight. Had a ninth sibling before founding out it's fake.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.
I can be entertaining until you realize some pieces have been lost.
What belongs to you but others use it more than you do?
The answer I give is yes, but what I mean is no. What was the question?