When it comes to fashion, running the family business is often the name of the game. From design house legacies to model siblings, the fashion industry is known for its close-knit community of familial ties. Prada, Fendi, and Hermès are all known as top-tier luxury labels, but there are also generations of family behind the brands' names. Other families, like the Arnaults, you might not know, but should. Here, discover fashion's 10 most important families.