Bruce Willis
Ben Jordan

Michelle Pfeiffer
Katie Jordan

Rob Reiner
Stan Kogen

Colleen Rennison
Erin Jordan (at Ten)

Jake Sandvig
Josh Jordan (at Twelve)

Julie Hagerty
Liza

Rita Wilson
Rachel Kogen

Paul Reiser
Dave

Red Buttons
Arnie Jordan

Betty White
Lillian Jordan

Jayne Meadows
Dot

Tom Poston
Harry

Casey Boersma
Josh Jordan (at Two and a Half)

Dylan Boersma
Josh Jordan (at Three)

Ken Lerner
Dr. Rifkin

Albert Hague
Dr. Siegler

Bill Kirchenbauer
Eddie Kirby

Yaping
Store Clerk