<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
How do you do blood brothers or blood sisters?
<|assistant|>
Blood brothers or blood sisters is done by exchanging blood between two people, usually by pricking their hands or another body part and placing the blood together. It is a symbolic act meant to signify the strength of a binding friendship. In some cultures, swearing an oath can also be done to cement a bond.