The Dunphy girls' room, where Alex and Haley have had so many sisterly squabbles, actually doubles as Phil and Claire's bedroom. On the days when the girls are shooting a scene, Phil and Claire's furniture gets stowed away and vice versa.
As for their on-set chemistry, the cast says "it's all love," but like any family, they too can get on each other's nerves.
"Like any good American family, we're in denial. We sweep our feeling under the rug and go home and drink," Julie Bowen joked.
Bowen, a mother of three on the show and to a saner family in real life, said the chaos at home can at times mirror her TV life.
"The chaos is similar," Bowen told Roberts. "These kids are so much more professional and together ...So far none of these kids have asked me to change their diaper, and I really appreciate that."
Nolan Gould and Ariel Winter, who play siblings Luke and Alex Dunphy on the show, said they can fight like brother and sister over whose turn it is to use the computer to check Facebook.
"I actually broke up a few fights over the computer," Bowen admits. "There are times when Nolan and Ariel are fighting over the computer and 'I'm like, that's it!'"
When it comes to which actor is most like their character in real-life, the cast unanimously pointed to Ty Burell, who plays quirky dad Phil Dunphy. "I do a lot of tripping and falling in real life," he joked.
Eric Stonestreet, who plays gay dad Cameron, and Ariel Winter, who plays Alex, were voted the most different from their on-screen personas.
Mitchell and Cam's daughter Lilly, who is so quiet and calm in front of the camera, is played by a set of twins who are quiet and well-behaved by nature, according to the cast.
"It's booze. [Lily] arrives very drunk every day," Jesse Tyler Ferguson joked. "She is remarkably quiet. She comes on the set and she's immediately in character. She is very, very committed to her craft."
All in all, they know they have a good thing going and are grateful for that.
"We all really love each other which I think is good for the show," said Winter.