When you're reading Cheaper by the Dozen, it's easy to forget that this is set a *long* time ago.
Frank Gilbreth (Dad) was born in 1868. That was only three years after the end of the Civil War!
Notice when the kids were born - Anne, Mary and Ernestine were all born more than 100 years ago. There's a reason the stories about the car are so funny!
What was happening in the Nineteen-Teens and Nineteen-Twenties?
In the Teens, the everyone reeled from the "War to End all Wars" - the First World War.
Women's clothing was changing radically, from the stiff and voluminous Victorian clothing, to that of the Flappers of the 1920s.
While inventors had been making automobiles for a while, people didn't really start buying them until very early in the 1900s. The Ford Model T (which many people think of as the "first car", even though it wasn't) was produced and sold between 1908 and 1927.
What we normally think of as a Typewriter first appeared just before 1900 (hence the touch-typing lessons the children endured!) (Some of the earlier typewriters were pretty scary!)
Many, many things were changing, and Frank and Lillian Gilbreth were on the forefront, helping to facilitate that change. And they had twelve little guine-pigs to practice their theories on!