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Yeah, I don't think this is the best game for your nephew. Personally, I'd get him Super Smash Brothers Ultimate instead. Shooters are difficult, and your nephew would probably get more enjoyment and replayability from Smash, as it's pretty easy to pick up and he can easily play with friends. Easy to play, hard to master sort of thing, (although you could say the same thing about Splatoon 2, but it being mostly an online game makes it less forgiving in the long run)