who plays kevin in this is us
Milana Vayntrub, This Is Us, photo by: Ron Batzdorff/NBC. In the This Is Us episode âThe Triâp, the âBig Threeâ adult siblings Kate (Chrissy Metz), Kevin (Justin Hartley) and Randall (Sterling K. Brown) visit their familyâs cabin after an emotional Thanksgiving dinner. Randall is angry with his mother (Mandy Moore) for not telling him she knew his birth father from day one.