Things have been moving very quickly between Kate (Chrissy Metz) and Toby (Chris Sullivan) on This Is Us, but they're about to hit a major speed bump: Kate's brother Kevin (Justin Hartley).

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You see, Kate's close relationship with her twin brother is going to come between her and her boyfriend in a big way in the next episode. Kate will have to choose between them, and she might not have the strength to choose what is best for her.

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