This book is about what life was like being part of a family of 12 children in which the father was a time and motion expert. Time and motion studies were an important thing in the late 1800s and early 1900s when they were used to make workplaces more efficient.
In Chapter 11, we see what it is like when the Gilbreth family goes on vacation to Nantucket. The funniest parts of the chapter (as with much of the book) come when Mr. Gilbreth tries to force people to learn and to do it his way. He tries to force his wife to learn how to float. Most amusingly, he teaches his kids Morse code by painting really dumb jokes (at least one of which is vaguely racist) on the walls and ceilings of the place where the family is staying.