The Brother And The Boyfriend
Riddle: Emma was arrested for robbing a bank. The police wanted to arrest Emma's boyfriend as well because he was supposedly an accomplice. The officers found four men-Kevin, Miles, Paul, and Stanley-and interrogated them. One of them is the boyfriend who is lying. Another person was Emma's brother, who did not assist with the robbery but was also lying because he wanted to help. And the other two boys were innocent and telling the truth. Each person says the following: Kevin: Stanley is her boyfriend. Miles: Paul is lying. Paul: Kevin is lying. Stanley: Miles is not her brother. Who is Emma's brother, and who is her boyfriend?
Answer: Kevin is Emma's brother, and Miles is her boyfriend. If Kevin is telling the truth, then Stanley is lying because the boyfriend lies. This means Miles is also lying because according to these conditions, Miles IS the brother who is lying. But then, Paul is telling the truth. It contradicts that Kevin is telling the truth because both of them cannot be truthful at the same time. So, Kevin is lying, Paul is telling the truth, and Miles is lying. By default, Stanley is the other man telling the truth. The two liars are Kevin and Miles; they are Emma's boyfriend and brother. Since Stanley said that Miles is NOT her brother, and that statement is true, it means Kevin is her brother, and Miles is her boyfriend.
Source: https://www.riddles.com/index.php/11377
