It's a metaphor. 
To help you understand why, here's the definitions of both:
Simile: it's a <span>figure of speech involving the comparison of one thing with another thing of a different kind, it's used to make writing seem more vivid.
Metaphor: this is also a</span><span> figure of speech in which a word or phrase is applied to an object or action to which it is not literally applicable.
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Family items are what shows you the history of your lineage; without family items, we would have no memories or virtues to uphold. For example, a necklace passed down from generation to generation is important to show that you are a part of the family, and care about your values and beliefs.