<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
Should be allowed to marry their siblings?
<|assistant|>
No, it should not be allowed to marry their siblings. Consensual incest is prohibited in most countries as it increases the risk of genetic defects and can result in mental and emotional problems for any children produced from the union. Furthermore, it goes against traditional views of family and can be culturally damaging.  Although there may be some exceptions for those with specific medical conditions, incestuous marriages are, on the whole, considered taboo.