Final answer:
The provided text does not contain information about Jape commanding Reuben to thank anyone for his dinner, making it impossible to answer the student's question.
Step-by-step explanation:
The passage does not explicitly mention Jape commanding Reuben to thank anyone for his dinner. The provided excerpts suggest that there is a focus on dining, meals, and gratitude expressed through gifts or polite gestures, but there is no direct answer to whom Reuben is to thank based on the given text. Therefore, the passage presented does not contain enough context to confidently provide an answer to the question about Jape and Reuben.