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plural subfamilies
(taxonomy) A taxonomic category ranking between a family and a genus; formerly called a tribe examples
A secondary or subordinate grouping. quotations examples
There is a handy font editor tool in the engine, where you can import your font and create family and subfamily for your font (for example, the same font can have a family for its bold, italic, light, and dark style as its subfamily).
2015, Nicola Valcasara, Unreal Engine Game Development Blueprints, page 142