I am a software engineer working in India. I live with my wife and younger brother who is preparing for management studies. Yesterday I dug into his computer and I was shocked when I found that he is having a relationship with my cousin's daughter, who is graduating in English and Dance.
I have started my married life 6 months back so I am not experienced enough to handle this kind of situation. From their chat history I was able to figure out that they have been in relationship for the last two years. There were also some messages that say the girl once consumed all the medicine available in her house (I guess she was trying to commit suicide).
Can anyone please suggest what to do in this situation? If I share this with my cousin, that too looks dangerous. If I share it with my parents I am afraid that my brother will not able to face them if they talk with him. I am not properly aware of my brother's state of mind so I am little afraid to talk with him too.
EDIT
Age of my brother : 26
Age of my cousin's daughter : 21+
Why was I looking through his computer records : Once my computer was not working properly, so I was browsing web on his computer. I was searching a site in history of browser, where I see there were more than expected url for Facebook messages. I just clicked on one, and Facebook was logged in so I got access to all messages interchanged.
Yes he was aware of that, at that time he was in same room.
Why I feel there is a need to intervene: Because this is so wrong. I mean how can he do it with cousin's daughter.
Why this question is related to parenting: because my young brother lives with me, and it's cultural here that older brothers watch out for the younger ones when parents aren't around.