Milo Ventimiglia as Jack Pearson: Rebecca 's husband, and Kate, Kevin, & Randall 's father. Mandy Moore as Rebecca Pearson (née Malone): Jack 's wife, and Kate, Kevin, & Randall 's mother. Sterling K. Brown as Randall Pearson: Jack & Rebecca 's son, and Kate & Kevin 's brother. Also played by Niles Fitch (age 15) and Lonnie Chavis (ages 8 -- 10). Chrissy Metz as Kate Pearson: Jack & Rebecca 's daughter, and Kevin & Randall 's sister. Also played by Hannah Zeile (age 15) and Mackenzie Hancsicsak (ages 8 -- 10). Justin Hartley as Kevin Pearson: Jack & Rebecca 's son, and Kate & Randall 's brother. Also played by Logan Shroyer (age 15) and Parker Bates (ages 8 -- 10). Susan Kelechi Watson as Beth Pearson: Randall 's wife, and mother of Tess and Annie. Chris Sullivan as Toby Damon: Kate 's fiancé. Ron Cephas Jones as William H. Hill (aka Shakespeare): Randall 's biological father. Also played by Jermel Nakia as a youth.
who plays randalls father on this is us
Milo Ventimiglia Ron Cephas Jones by Jermel Nakia as a youth