Problem: I put the butterfly wing on the table and *it* broke.

Are "it" and "the butterfly wing" the same?
Answer: yes

Problem: The Wainwrights treated Mr. Crowley like a prince until he made his will in their favor; then they treated him like dirt. Folks said he died just to be rid of *their* everlasting nagging.

Are "their" and "Wainwrights" the same?
Answer: yes

Problem: Dr. Adams informed Kate that *she* had cancer and presented several options for future treatment.

Are "she" and "Kate" the same?
Answer: yes

Problem: Paul tried to call George on the phone, but *he* wasn't available.

Are "he" and "George" the same?
Answer:
yes