I don't know whether you noticed in the character list, all but one of The Twelve have now passed away. The only one still living is Fred.
Here's what the Twelve did as adults:
Anne Moller Gilbreth Barney - Graduated from college, and became a homemaker.
Mary Elizabeth Gilbreth - died at age 6
Ernestine Moller Gilbreth Carey - Graduated from college, became a retail buyer, and published five books.
Martha Bunker Gilbreth Tallman- Graduated from college, and became a homemaker.
Frank Bunker Gilbreth, Jr. - Graduated from college and became a journalist, newspaper executive, and published twelve books.
William Moller Gilbreth (Bill) - Graduated from college and became an engineer.
Lillian Moller Gilbreth Johnson - Graduated from college, and became a homemaker.
Frederick Moller Gilbreth (Fred) - Graduated from college, and became an engineer.
Daniel Bunker Gilbreth (Dan) - Graduated from college and ran an import/export business.
John Moller Gilbreth (Jack) - Graduated from college and became an engineer.
Robert Moller Gilbreth (Bob) - Graduated from college, became a teacher, principal and member of the New Hampshire Legislature.
Jane Moller Gilbreth Heppes- Graduated from college and became a homemaker.
Do you notice the refrain "Graduated from college and...?" Every one of the living twelve graduated from college. Are you putting a child through college? Can you visualize what it would mean to put ELEVEN children through college?
Did the Twelve continue their parents' tradition of large families? No. At the time of Lillie's death in 1972, she had only 30 grandchildren (2.7 children each for each of the remaining eleven) and only 22 great-grandchildren. (There have been more since her death - I think I remember reading that the next generation was averaging about 2.4 children.)
Would you want to be part of a large family? Or be the parent of a large family?