Final answer:
The morning after the family receives the monkey's paw, the breakfast tone is likely heavy-hearted and horrified, filled with unease from the supernatural events.
Step-by-step explanation:
The tone at breakfast the morning after the family receives the monkey's paw could be best described as heavy-hearted and horrified. After experiencing the eerie events related to the monkey's paw, the characters are likely to be deeply unsettled and carry a sense of dread. This is reflected in the overall atmosphere of the breakfast scene where the characters would be consuming their meal amidst a profound sense of unease and the haunting memories of the previous night's supernatural occurrences.