How the Superwealthy Plan to Make Sure Their Kids Stay Superwealthy: Passing on a fortune isn’t as easy as it seems.

The first clue that this is no ordinary crowd of sulky teenagers comes when the instructor asks those who’ve invested in the market to raise their hands. Most hands go up. As a financial planner explains the benefits of investing, one boy interrupts. “What do you suggest investing in right now?” asks Liam Whitfield, 18, a senior at a private Seattle high school, with swooping bangs and a shaggy sweater. The speaker, from a local investment firm, suggests a standard mix of 60 percent stocks and 40 percent bonds. Whitfield looks disappointed. He already owns shares of Apple, Facebook, and Starbucks. “I was kind of looking for an actual stock tip,” he says. ...