Answer:
The detail that shows that the narrator has a wealthy family is "Father agreed to finance me for a year." This indicates that the narrator's father was able to provide financial support for him, suggesting that the family has some level of wealth. The other details do not necessarily indicate wealth - "I came east, permanently, I thought, in the spring of twenty-two" simply indicates a change in location, and "I participated in that delayed Teutonic migration known as the Great War" suggests military service but does not necessarily indicate wealth.
Step-by-step explanation: