Are you a serial killer?

This is a real question, used by the FBI! There isnt a right or wrong answer to this question however if you provide a certain answer that is looked out for you are 70% likely to become a serial killer sometime in your life. Here is the question:

'You are attending a funeral for Miss X (ladies, think "Mr X"). You notice that Miss Y (Mr Y) has attended the funeral, whom you're really interested in. That night you kill Miss X's (Mr X's) sister (brother). Why do you do it?'

think before you loook for the answer

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Well this is the answer that they look for:

Miss Y is attending Miss X's funeral. So if you killed Miss X's sister, there would be another funeral and you would see Miss Y again!