What family owns Trader Joe's?

I'm curious to know, who exactly is the family behind the popular grocery chain Trader Joe's? Is it a well-known family in the retail industry, or perhaps they've managed to keep a relatively low profile despite their success? I'm interested in understanding the origins and history of this family, as well as any notable achievements or milestones they've reached in their business endeavors. Additionally, I'm wondering if there are any unique aspects to their management style or approach to customer service that have contributed to the brand's enduring popularity and success.