Thanks for your response!
After reading your steps, I am sure that I was doing the procedure correctly. Also, I followed the exact same steps with another family (not my family, a pre-existing one), and it worked fine.
With the one that DID work: I went to edit map, clicked on the house tag, chose copy household to library, clicked household only. Then it appeared in my library when it was done processing.
With the one that DID NOT work: I went to edit map, clicked on the house tag, chose copy household to library, clicked household only. Then it DID NOT appear in my library when it was done processing.
The only thing different that I can think of is that the one that did not work was my active household. Although, it has worked in the past when I've copied my active household (the green tag).
Thank you again!