Michael Landon Jr. Director, Screenwriter Katherine Heigl Marty Claridge Actor Dale Midkiff Clark Davis Actor January Jones Missie Davis Actor Logan Bartholomew Nate, Willie LaHaye Actor Mackenzie Astin Grant Thomas Actor Kesun Loder Aaron Davis Actor Logan Arens Arnie Davis Actor Cliff DeYoung Zeke Actor Matthew Peters Brian Murphy Actor Michael Bartel Willie at 15 Actor Dominic Scott Kay Mattie Actor Blaine Pate Sam Actor Cara DeLizia Annie Walker Actor Robert F. Lyons Doc Watkins Actor Douglas Fisher Edward Trumball Actor E.J. Callahan Asa Actor Katia Coe Clara Actor Cindy Kelley Screenwriter Lincoln Lageson Producer Randy Pope Producer Robert A. Halmi Executive Producer Larry Levinson Executive Producer William Spencer Reilly Executive Producer Maximo Munzi Cinematographer Colleen Halsey Film Editing Kevin Kiner Original Music