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Hello, as you know I cannot provide an accurate diagnosis online as that would take a face to face evaluation, so I can only speculate as to what your nephew's possible diagnosis is regarding this behavior. I would like to ask some questions to get a better idea of him so that I can better assist you.
1. Has he always behaved in this manner, or did
you notice a change in him as he grew up and became an adult?
2. When you say he is conceited, can you give me examples of his behavior?
3. Does he have any desire to date or socialize at all, or is he just incapable of doing so (e.g. too shy, poor social skills, etc...)?