The question is incomplete, but i will try my best to give you helpful tips that would aid you in answering the question. There is no bolded word here, so I would give you a general answer.
A bold word is used to lay emphasis on a word or phrase that otherwise would have gone unnoticed it is used to call the attention of a reader to something.
According to the given sentence, we are told that Oliver Wendell comes from a family that loves reading and learning, and as a result of this, he started reading heavily from when he was a small boy.
Therefore, to find the example of the bolded words, you need to ask yourself:
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