Final answer:
Bilbo's mother's family was not richer than the Bagginses.
Step-by-step explanation:
d. They were richer than the Bagginses.
Based on the options provided, the statement that is NOT true of Bilbo's mother is that her family was richer than the Bagginses. The correct option is d. The passage indicates that there was something not entirely hobbit-like about her family, they were more respectable than the Bagginses, and once in a while one of the family would go off on an adventure.
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