In the late 1400's, a Count, who is hosting a dinner party, receives a message from his steward. The note lists that the following relatives of the Count will be attending the party:
- The father's brother-in-law
- The brother's father-in-law
- The father-in-law's brother
- The brother-in-law's father
The Count immediately assumes that there will be four guests. However, the steward's message makes him seem less sure.
What is the least number of guests that the Count can expect?