Talk to him a few times, sometimes there is a glich where you have to talk 2-3 times before he realizes it. Do this if it does not work, go back and double check room by room, as well as the basement.. there is a lot of mutants in there. Also run around outside make sure you get all the ones on the Yellow platform.. that should help =)
If this do not work , private message me and ill go re do it and walk ya through it =)

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